From 8fd979c23bcb4d8be51325e1a1cc6da8e74db5fa Mon Sep 17 00:00:00 2001 From: atomiks Date: Sat, 30 Dec 2017 23:45:05 +1100 Subject: [PATCH 01/62] Create elo snippet --- snippets/elo.md | 25 +++++++++++++++++++++++++ tag_database | 1 + 2 files changed, 26 insertions(+) create mode 100644 snippets/elo.md diff --git a/snippets/elo.md b/snippets/elo.md new file mode 100644 index 000000000..9d50ba1d0 --- /dev/null +++ b/snippets/elo.md @@ -0,0 +1,25 @@ +### elo + +Computes the new ratings between two opponents using the Elo rating formula. It takes an array +of two pre-ratings and returns an array containing two post-ratings. The winner's rating is be the first element of the array. + +Use `Math.pow()` and math operators to compute the expected score (chance of winning) of each opponent +and compute the change in rating for each. Omit the second argument to use the default K-factor of +32, or supply a custom K-factor value. + +```js +const elo = ([a, b], kFactor = 32) => { + const expectedScore = (self, opponent) => 1 / (1 + Math.pow(10, (opponent - self) / 400)); + const [eA, eB] = [expectedScore(a, b), expectedScore(b, a)]; + const newRating = (rating, index) => + rating + kFactor * ((index === 0 ? 1 : 0) - (index === 0 ? eA : eB)); + return [newRating(a, 0), newRating(b, 1)]; +}; +``` + +```js +elo([1200, 1200]); // [1216, 1184] +elo([1000, 2000]); // [1031.8991261061358, 1968.1008738938642] +elo([1500, 1000]); // [1501.7036868864648, 998.2963131135352] +elo([1200, 1200], 64); // [1232, 1168] +``` diff --git a/tag_database b/tag_database index f5633a5fa..7ca86d900 100644 --- a/tag_database +++ b/tag_database @@ -29,6 +29,7 @@ distinctValuesOfArray:array dropElements:array dropRight:array elementIsVisibleInViewport:browser +elo:math escapeHTML:string escapeRegExp:string everyNth:array From d434b99f5cfef653b3b09b150e67d3fd025ff034 Mon Sep 17 00:00:00 2001 From: atomiks Date: Sat, 30 Dec 2017 23:45:45 +1100 Subject: [PATCH 02/62] Add link --- snippets/elo.md | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/snippets/elo.md b/snippets/elo.md index 9d50ba1d0..85b54d35b 100644 --- a/snippets/elo.md +++ b/snippets/elo.md @@ -1,7 +1,8 @@ ### elo -Computes the new ratings between two opponents using the Elo rating formula. It takes an array -of two pre-ratings and returns an array containing two post-ratings. The winner's rating is be the first element of the array. +Computes the new ratings between two opponents using the [Elo rating system](https://en.wikipedia.org/wiki/Elo_rating_system). It takes an array +of two pre-ratings and returns an array containing two post-ratings. +The winner's rating is be the first element of the array. Use `Math.pow()` and math operators to compute the expected score (chance of winning) of each opponent and compute the change in rating for each. Omit the second argument to use the default K-factor of From c7faf04ce0b1fb768cc5ade7f4b36d0d3192b04a Mon Sep 17 00:00:00 2001 From: atomiks Date: Sat, 30 Dec 2017 23:47:43 +1100 Subject: [PATCH 03/62] fix typo --- snippets/elo.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/snippets/elo.md b/snippets/elo.md index 85b54d35b..5be73476f 100644 --- a/snippets/elo.md +++ b/snippets/elo.md @@ -2,7 +2,7 @@ Computes the new ratings between two opponents using the [Elo rating system](https://en.wikipedia.org/wiki/Elo_rating_system). It takes an array of two pre-ratings and returns an array containing two post-ratings. -The winner's rating is be the first element of the array. +The winner's rating is the first element of the array. Use `Math.pow()` and math operators to compute the expected score (chance of winning) of each opponent and compute the change in rating for each. Omit the second argument to use the default K-factor of From e093e132c3182f0fea70b9c1d70f8c57dc04c5d3 Mon Sep 17 00:00:00 2001 From: atomiks Date: Sun, 31 Dec 2017 00:02:46 +1100 Subject: [PATCH 04/62] simplify newRating function --- snippets/elo.md | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/snippets/elo.md b/snippets/elo.md index 5be73476f..1c52db62b 100644 --- a/snippets/elo.md +++ b/snippets/elo.md @@ -12,9 +12,8 @@ and compute the change in rating for each. Omit the second argument to use the d const elo = ([a, b], kFactor = 32) => { const expectedScore = (self, opponent) => 1 / (1 + Math.pow(10, (opponent - self) / 400)); const [eA, eB] = [expectedScore(a, b), expectedScore(b, a)]; - const newRating = (rating, index) => - rating + kFactor * ((index === 0 ? 1 : 0) - (index === 0 ? eA : eB)); - return [newRating(a, 0), newRating(b, 1)]; + const newRating = (rating, index) => rating + kFactor * (index - (index ? eA : eB)); + return [newRating(a, 1), newRating(b, 0)]; }; ``` From ee4820d61e5ed4f1351dd7fd3800d82ddac400ae Mon Sep 17 00:00:00 2001 From: atomiks Date: Sun, 31 Dec 2017 17:13:05 +1100 Subject: [PATCH 05/62] Optimise further --- snippets/elo.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/snippets/elo.md b/snippets/elo.md index 1c52db62b..991b74019 100644 --- a/snippets/elo.md +++ b/snippets/elo.md @@ -5,14 +5,14 @@ of two pre-ratings and returns an array containing two post-ratings. The winner's rating is the first element of the array. Use `Math.pow()` and math operators to compute the expected score (chance of winning) of each opponent -and compute the change in rating for each. Omit the second argument to use the default K-factor of +and compute the new rating for each. Omit the second argument to use the default K-factor of 32, or supply a custom K-factor value. ```js const elo = ([a, b], kFactor = 32) => { const expectedScore = (self, opponent) => 1 / (1 + Math.pow(10, (opponent - self) / 400)); - const [eA, eB] = [expectedScore(a, b), expectedScore(b, a)]; - const newRating = (rating, index) => rating + kFactor * (index - (index ? eA : eB)); + const newRating = (rating, i) => + rating + kFactor * (i - (i ? expectedScore(a, b) : expectedScore(b, a))); return [newRating(a, 1), newRating(b, 0)]; }; ``` From 13e4c9280034c29974adeaf2746db8c66e6aaf09 Mon Sep 17 00:00:00 2001 From: atomiks Date: Sun, 31 Dec 2017 17:19:55 +1100 Subject: [PATCH 06/62] Avoid repeating function call --- snippets/elo.md | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/snippets/elo.md b/snippets/elo.md index 991b74019..1fbbe1986 100644 --- a/snippets/elo.md +++ b/snippets/elo.md @@ -11,8 +11,7 @@ and compute the new rating for each. Omit the second argument to use the default ```js const elo = ([a, b], kFactor = 32) => { const expectedScore = (self, opponent) => 1 / (1 + Math.pow(10, (opponent - self) / 400)); - const newRating = (rating, i) => - rating + kFactor * (i - (i ? expectedScore(a, b) : expectedScore(b, a))); + const newRating = (rating, i) => rating + kFactor * (i - expectedScore(i ? a : b, i ? b : a)); return [newRating(a, 1), newRating(b, 0)]; }; ``` From 5099ed40c305168ed12eae11eb3555c530459825 Mon Sep 17 00:00:00 2001 From: atomiks Date: Sun, 31 Dec 2017 19:04:35 +1100 Subject: [PATCH 07/62] switch to exponent operator --- snippets/elo.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/snippets/elo.md b/snippets/elo.md index 1fbbe1986..671d1ccea 100644 --- a/snippets/elo.md +++ b/snippets/elo.md @@ -4,13 +4,13 @@ Computes the new ratings between two opponents using the [Elo rating system](htt of two pre-ratings and returns an array containing two post-ratings. The winner's rating is the first element of the array. -Use `Math.pow()` and math operators to compute the expected score (chance of winning) of each opponent -and compute the new rating for each. Omit the second argument to use the default K-factor of -32, or supply a custom K-factor value. +Use the exponent `**` operator and math operators to compute the expected score (chance of winning) +of each opponent and compute the new rating for each. Omit the second argument to use the default +K-factor of 32, or supply a custom K-factor value. ```js const elo = ([a, b], kFactor = 32) => { - const expectedScore = (self, opponent) => 1 / (1 + Math.pow(10, (opponent - self) / 400)); + const expectedScore = (self, opponent) => 1 / (1 + 10 ** ((opponent - self) / 400)); const newRating = (rating, i) => rating + kFactor * (i - expectedScore(i ? a : b, i ? b : a)); return [newRating(a, 1), newRating(b, 0)]; }; From 4824abc7de586f5aa5670586c07686890b97e858 Mon Sep 17 00:00:00 2001 From: atomiks Date: Sun, 31 Dec 2017 21:48:13 +1100 Subject: [PATCH 08/62] Add isPrimitive utility snippet --- snippets/isPrimitive.md | 22 ++++++++++++++++++++++ tag_database | 1 + 2 files changed, 23 insertions(+) create mode 100644 snippets/isPrimitive.md diff --git a/snippets/isPrimitive.md b/snippets/isPrimitive.md new file mode 100644 index 000000000..cd90501b3 --- /dev/null +++ b/snippets/isPrimitive.md @@ -0,0 +1,22 @@ +### isPrimitive + +Returns a boolean determining if the supplied value is primitive or not. + +Use `Array.includes()` on an array of type strings, supplying the type using `typeof`. +Since `typeof null` evaluates to `'object'`, it needs to be directly compared. + +```js +const isPrimitive = value => + ['string', 'number', 'symbol', 'boolean', 'undefined'].includes(typeof value) || value === null; +``` + +```js +isPrimitive(window.someNonExistentProperty); // true +isPrimitive(null); // true +isPrimitive(50); // true +isPrimitive('Hello!'); // true +isPrimitive(false); // true +isPrimitive(Symbol()); // true +isPrimitive([]); // false +isPrimitive(new String('Hello!')); // false +``` diff --git a/tag_database b/tag_database index d897e319c..9287acd90 100644 --- a/tag_database +++ b/tag_database @@ -71,6 +71,7 @@ isEven:math isFunction:utility isNumber:utility isPrime:math +isPrimitive:utility isString:utility isSymbol:utility JSONToDate:date From 89102ea9ac49769edbb2e8e9c1a74ceee26e2a52 Mon Sep 17 00:00:00 2001 From: atomiks Date: Sun, 31 Dec 2017 22:55:55 +1100 Subject: [PATCH 09/62] Add memoize snippet --- snippets/memoize.md | 23 +++++++++++++++++++++++ tag_database | 1 + 2 files changed, 24 insertions(+) create mode 100644 snippets/memoize.md diff --git a/snippets/memoize.md b/snippets/memoize.md new file mode 100644 index 000000000..8a71702e1 --- /dev/null +++ b/snippets/memoize.md @@ -0,0 +1,23 @@ +### memoize + +Returns the memoized (cached) function. + +Use `Object.create(null)` to create an empty object without Object.prototype +(so that those properties are not resolved if the input value is something like 'hasOwnProperty'). +Return a function which takes a single argument to be supplied to the memoized function +by first checking if the function's output for that specific input value is already cached, or +store and return it if not. + +```js +const memoize = fn => { + const cache = Object.create(null); + return value => cache[value] || (cache[value] = fn(value)); +}; +``` + +```js +// See the `anagrams` snippet. +const anagramsCached = memoize(anagrams); +anagramsCached('javascript'); // takes a long time +anagramsCached('javascript'); // returns virtually instantly since it's now cached +``` diff --git a/tag_database b/tag_database index d897e319c..f82dd92c5 100644 --- a/tag_database +++ b/tag_database @@ -81,6 +81,7 @@ lowercaseKeys:object mapObject:array max:math median:math +memoize:function min:math negate:logic nthElement:array From 3f392b72ecb93ee973fef50edd72c74e8ac45630 Mon Sep 17 00:00:00 2001 From: Angelos Chalaris Date: Sun, 31 Dec 2017 13:57:41 +0200 Subject: [PATCH 10/62] Added list of collaborators to the README --- static-parts/README-end.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/static-parts/README-end.md b/static-parts/README-end.md index c9d2d14b1..8b9c13e84 100644 --- a/static-parts/README-end.md +++ b/static-parts/README-end.md @@ -1,3 +1,10 @@ +## Collaborators + +| [](https://github.com/Chalarangelo)
[Angelos Chalaris](https://github.com/Chalarangelo) | [](https://github.com/Pl4gue)
[David Wu](https://github.com/Pl4gue) | [](https://github.com/fejes713)
[Stefan Feješ](https://github.com/fejes713) | [](https://github.com/kingdavidmartins)
[King David Martins](https://github.com/iamsoorena) | [](https://github.com/iamsoorena)
[Soorena Soleimani](https://github.com/iamsoorena) | +| --- | --- | --- | --- | --- | +| [](https://github.com/elderhsouza)
[Elder Henrique Souza](https://github.com/elderhsouza) | [](https://github.com/skatcat31)
[Robert Mennell](https://github.com/skatcat31) | [](https://github.com/atomiks)
[atomiks](https://github.com/atomiks) | + + ## Credits *Icons made by [Smashicons](https://www.flaticon.com/authors/smashicons) from [www.flaticon.com](https://www.flaticon.com/) is licensed by [CC 3.0 BY](http://creativecommons.org/licenses/by/3.0/).* From 9f68cebb67d1c393bcb8ea00e7a6175be1af438d Mon Sep 17 00:00:00 2001 From: Travis CI Date: Sun, 31 Dec 2017 11:58:36 +0000 Subject: [PATCH 11/62] Travis build: 702 [ci skip] --- README.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/README.md b/README.md index 9cdeb42e2..6a6b16b23 100644 --- a/README.md +++ b/README.md @@ -4332,6 +4332,13 @@ yesNo('Foo', true); // true
[⬆ Back to top](#table-of-contents) +## Collaborators + +| [](https://github.com/Chalarangelo)
[Angelos Chalaris](https://github.com/Chalarangelo) | [](https://github.com/Pl4gue)
[David Wu](https://github.com/Pl4gue) | [](https://github.com/fejes713)
[Stefan Feješ](https://github.com/fejes713) | [](https://github.com/kingdavidmartins)
[King David Martins](https://github.com/iamsoorena) | [](https://github.com/iamsoorena)
[Soorena Soleimani](https://github.com/iamsoorena) | +| --- | --- | --- | --- | --- | +| [](https://github.com/elderhsouza)
[Elder Henrique Souza](https://github.com/elderhsouza) | [](https://github.com/skatcat31)
[Robert Mennell](https://github.com/skatcat31) | [](https://github.com/atomiks)
[atomiks](https://github.com/atomiks) | + + ## Credits *Icons made by [Smashicons](https://www.flaticon.com/authors/smashicons) from [www.flaticon.com](https://www.flaticon.com/) is licensed by [CC 3.0 BY](http://creativecommons.org/licenses/by/3.0/).* From d8d17b84f2539e3525aa8c02aa750d3b50a41c51 Mon Sep 17 00:00:00 2001 From: Travis CI Date: Sun, 31 Dec 2017 12:01:13 +0000 Subject: [PATCH 12/62] Travis build: 703 [ci skip] --- README.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 6a6b16b23..01f416b3c 100644 --- a/README.md +++ b/README.md @@ -77,7 +77,7 @@ -### 🖥️ Browser +### 🌐 Browser
View contents @@ -1437,7 +1437,7 @@ zipObject(['a', 'b'], [1, 2, 3]); // {a: 1, b: 2}
[⬆ Back to top](#table-of-contents) --- - ## 🖥️ Browser + ## 🌐 Browser ### arrayToHtmlList From 19247593da3c13be95a173937e7a3ed7e60abfc1 Mon Sep 17 00:00:00 2001 From: Angelos Chalaris Date: Sun, 31 Dec 2017 14:04:44 +0200 Subject: [PATCH 13/62] Update memoize.md --- snippets/memoize.md | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/snippets/memoize.md b/snippets/memoize.md index 8a71702e1..c1b6b1343 100644 --- a/snippets/memoize.md +++ b/snippets/memoize.md @@ -2,11 +2,8 @@ Returns the memoized (cached) function. -Use `Object.create(null)` to create an empty object without Object.prototype -(so that those properties are not resolved if the input value is something like 'hasOwnProperty'). -Return a function which takes a single argument to be supplied to the memoized function -by first checking if the function's output for that specific input value is already cached, or -store and return it if not. +Use `Object.create(null)` to create an empty object without `Object.prototype` (so that those properties are not resolved if the input value is something like `'hasOwnProperty'`). +Return a function which takes a single argument to be supplied to the memoized function by first checking if the function's output for that specific input value is already cached, or store and return it if not. ```js const memoize = fn => { From c9a30dc4e5ad8d5bde57c63edb186000e8b515d6 Mon Sep 17 00:00:00 2001 From: Travis CI Date: Sun, 31 Dec 2017 12:07:56 +0000 Subject: [PATCH 14/62] Travis build: 707 [ci skip] --- README.md | 30 ++++++++++++++++++++++++++++++ docs/index.html | 10 +++++++++- 2 files changed, 39 insertions(+), 1 deletion(-) diff --git a/README.md b/README.md index 01f416b3c..2bcb93460 100644 --- a/README.md +++ b/README.md @@ -126,6 +126,7 @@ * [`compose`](#compose) * [`curry`](#curry) * [`functionName`](#functionname) +* [`memoize`](#memoize) * [`runPromisesInSeries`](#runpromisesinseries) * [`sleep`](#sleep) @@ -2176,6 +2177,35 @@ functionName(Math.max); // max (logged in debug channel of console)
[⬆ Back to top](#table-of-contents) +### memoize + +Returns the memoized (cached) function. + +Use `Object.create(null)` to create an empty object without `Object.prototype` (so that those properties are not resolved if the input value is something like `'hasOwnProperty'`). +Return a function which takes a single argument to be supplied to the memoized function by first checking if the function's output for that specific input value is already cached, or store and return it if not. + +```js +const memoize = fn => { + const cache = Object.create(null); + return value => cache[value] || (cache[value] = fn(value)); +}; +``` + +
+Examples + +```js +// See the `anagrams` snippet. +const anagramsCached = memoize(anagrams); +anagramsCached('javascript'); // takes a long time +anagramsCached('javascript'); // returns virtually instantly since it's now cached +``` + +
+ +
[⬆ Back to top](#table-of-contents) + + ### runPromisesInSeries Runs an array of promises in series. diff --git a/docs/index.html b/docs/index.html index 2acf4f2bb..d10bb750a 100644 --- a/docs/index.html +++ b/docs/index.html @@ -59,7 +59,7 @@ wrapper.appendChild(box); box.appendChild(el); }); - }

 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.

 

Adapter

call

Given a key and a set of arguments, call them when given a context. Primarily useful in composition.

Use a closure to call a stored key with stored arguments.

const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -436,6 +436,14 @@ multiplyAndAdd5(5, 2); // 15
 curry(Math.min, 3)(10)(50)(2); // 2
 

functionName
Logs the name of a function.
Use console.debug() and the name property of the passed method to log the method's name to the debug channel of the console.
const functionName = fn => (console.debug(fn.name), fn);
 
functionName(Math.max); // max (logged in debug channel of console)
+

memoize
Returns the memoized (cached) function.
Use Object.create(null) to create an empty object without Object.prototype (so that those properties are not resolved if the input value is something like 'hasOwnProperty'). Return a function which takes a single argument to be supplied to the memoized function by first checking if the function's output for that specific input value is already cached, or store and return it if not.
const memoize = fn => {
+  const cache = Object.create(null);
+  return value => cache[value] || (cache[value] = fn(value));
+};
+
// See the `anagrams` snippet.
+const anagramsCached = memoize(anagrams);
+anagramsCached('javascript'); // takes a long time
+anagramsCached('javascript'); // returns virtually instantly since it's now cached
 

runPromisesInSeries
Runs an array of promises in series.
Use Array.reduce() to create a promise chain, where each promise returns the next promise when resolved.
const runPromisesInSeries = ps => ps.reduce((p, next) => p.then(next), Promise.resolve());
 
const delay = d => new Promise(r => setTimeout(r, d));
 runPromisesInSeries([() => delay(1000), () => delay(2000)]); // //executes each promise sequentially, taking a total of 3 seconds to complete

From 17ed77d31e498bd45bb6824e0e98807806942819 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 12:13:21 +0000
Subject: [PATCH 15/62] Travis build: 710 [ci skip]

---
 README.md              | 38 ++++++++++++++++++++++++++++++++++++++
 docs/index.html        | 12 +++++++++++-
 snippets/sampleSize.md | 10 +++++-----
 tag_database           |  1 +
 4 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 2bcb93460..f185c714d 100644
--- a/README.md
+++ b/README.md
@@ -260,6 +260,15 @@
+### _Uncategorized_ + +
+View contents + +* [`sampleSize`](#samplesize) + +
+ --- ## 🔌 Adapter @@ -4361,6 +4370,35 @@ yesNo('Foo', true); // true
[⬆ Back to top](#table-of-contents) +--- + ## _Uncategorized_ + +### sampleSize + +Gets `n` random elements at unique keys from `array` up to the size of `array`. + +Shuffle the array using the [Fisher-Yates algorithm](https://github.com/chalarangelo/30-seconds-of-code#shuffle). +Use `Array.slice()` to get the first `n` elements. +Omit the second argument, `n` to get only one element at random from the array. + +```js +const sampleSize = ([...arr], n = 1) => { + let m = arr.length; + while (m) { + const i = Math.floor(Math.random() * m--); + [arr[m], arr[i]] = [arr[i], arr[m]]; + } + return arr.slice(0, n); +}; +``` + +```js +sampleSize([1, 2, 3], 2); // [3,1] +sampleSize([1, 2, 3], 4); // [2,3,1] +``` + +
[⬆ back to top](#table-of-contents) + ## Collaborators diff --git a/docs/index.html b/docs/index.html index d10bb750a..6a66cb59d 100644 --- a/docs/index.html +++ b/docs/index.html @@ -59,7 +59,7 @@ wrapper.appendChild(box); box.appendChild(el); }); - }

 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.

 

Adapter

call

Given a key and a set of arguments, call them when given a context. Primarily useful in composition.

Use a closure to call a stored key with stored arguments.

const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -905,4 +905,14 @@ console.log(sdbm('age')); // 808122783
 yesNo('yes'); // true
 yesNo('No'); // false
 yesNo('Foo', true); // true
+

Uncategorized
sampleSize
Gets n random elements at unique keys from array up to the size of array.
Shuffle the array using the Fisher-Yates algorithm. Use Array.slice() to get the first n elements. Omit the second argument, n to get only one element at random from the array.
const sampleSize = ([...arr], n = 1) => {
+  let m = arr.length;
+  while (m) {
+    const i = Math.floor(Math.random() * m--);
+    [arr[m], arr[i]] = [arr[i], arr[m]];
+  }
+  return arr.slice(0, n);
+};
+
sampleSize([1, 2, 3], 2); // [3,1]
+sampleSize([1, 2, 3], 4); // [2,3,1]
 


\ No newline at end of file
diff --git a/snippets/sampleSize.md b/snippets/sampleSize.md
index f6187bdea..7b2480cba 100644
--- a/snippets/sampleSize.md
+++ b/snippets/sampleSize.md
@@ -7,17 +7,17 @@ Use `Array.slice()` to get the first `n` elements.
 Omit the second argument, `n` to get only one element at random from the array.
 
 ```js
-const sampleSize = ([...arr],n=1) => {
+const sampleSize = ([...arr], n = 1) => {
   let m = arr.length;
   while (m) {
     const i = Math.floor(Math.random() * m--);
     [arr[m], arr[i]] = [arr[i], arr[m]];
   }
-  return arr.slice(0,n)
-}
+  return arr.slice(0, n);
+};
 ```
 
 ```js
-sampleSize([1,2,3],2); // [3,1]
-sampleSize([1,2,3],4); // [2,3,1]
+sampleSize([1, 2, 3], 2); // [3,1]
+sampleSize([1, 2, 3], 4); // [2,3,1]
 ```
diff --git a/tag_database b/tag_database
index db90b4d02..b06cb8280 100644
--- a/tag_database
+++ b/tag_database
@@ -114,6 +114,7 @@ RGBToHex:utility
 round:math
 runPromisesInSeries:function
 sample:array
+sampleSize:uncategorized
 scrollToTop:browser
 sdbm:utility
 select:object

From 02906fe3cbf5c389b83c89da665ec276d6cce550 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 14:14:23 +0200
Subject: [PATCH 16/62] Update tag_database

---
 tag_database | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tag_database b/tag_database
index b06cb8280..e2bb75c7e 100644
--- a/tag_database
+++ b/tag_database
@@ -114,7 +114,7 @@ RGBToHex:utility
 round:math
 runPromisesInSeries:function
 sample:array
-sampleSize:uncategorized
+sampleSize:array
 scrollToTop:browser
 sdbm:utility
 select:object

From dab931d9ba1c4a10f1f515f4ea5abd90529e6c81 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 12:15:19 +0000
Subject: [PATCH 17/62] Travis build: 711 [ci skip]

---
 README.md       | 71 +++++++++++++++++++++++--------------------------
 docs/index.html | 22 +++++++--------
 2 files changed, 44 insertions(+), 49 deletions(-)

diff --git a/README.md b/README.md
index f185c714d..6659888fa 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@
 * [`quickSort`](#quicksort)
 * [`remove`](#remove)
 * [`sample`](#sample)
+* [`sampleSize`](#samplesize)
 * [`shuffle`](#shuffle)
 * [`similarity`](#similarity)
 * [`symmetricDifference`](#symmetricdifference)
@@ -260,15 +261,6 @@
 
 
 
-### _Uncategorized_
-
-

-View contents
-
-* [`sampleSize`](#samplesize)
-
-

-
 ---
  ## 🔌 Adapter
 
@@ -1199,6 +1191,38 @@ sample([3, 7, 9, 11]); // 9
 
[⬆ Back to top](#table-of-contents)
 
 
+### sampleSize
+
+Gets `n` random elements at unique keys from `array` up to the size of `array`.
+
+Shuffle the array using the [Fisher-Yates algorithm](https://github.com/chalarangelo/30-seconds-of-code#shuffle).
+Use `Array.slice()` to get the first `n` elements.
+Omit the second argument, `n` to get only one element at random from the array.
+
+```js
+const sampleSize = ([...arr], n = 1) => {
+  let m = arr.length;
+  while (m) {
+    const i = Math.floor(Math.random() * m--);
+    [arr[m], arr[i]] = [arr[i], arr[m]];
+  }
+  return arr.slice(0, n);
+};
+```
+
+

+Examples
+
+```js
+sampleSize([1, 2, 3], 2); // [3,1]
+sampleSize([1, 2, 3], 4); // [2,3,1]
+```
+
+

+
+
[⬆ Back to top](#table-of-contents)
+
+
 ### shuffle
 
 Randomizes the order of the values of an array, returning a new array.
@@ -4370,35 +4394,6 @@ yesNo('Foo', true); // true
 
 
[⬆ Back to top](#table-of-contents)
 
----
- ## _Uncategorized_
-
-### sampleSize
-
-Gets `n` random elements at unique keys from `array` up to the size of `array`.
-
-Shuffle the array using the [Fisher-Yates algorithm](https://github.com/chalarangelo/30-seconds-of-code#shuffle).
-Use `Array.slice()` to get the first `n` elements.
-Omit the second argument, `n` to get only one element at random from the array.
-
-```js
-const sampleSize = ([...arr], n = 1) => {
-  let m = arr.length;
-  while (m) {
-    const i = Math.floor(Math.random() * m--);
-    [arr[m], arr[i]] = [arr[i], arr[m]];
-  }
-  return arr.slice(0, n);
-};
-```
-
-```js
-sampleSize([1, 2, 3], 2); // [3,1]
-sampleSize([1, 2, 3], 4); // [2,3,1]
-```
-
-
[⬆ back to top](#table-of-contents)
-
 
 ## Collaborators
 
diff --git a/docs/index.html b/docs/index.html
index 6a66cb59d..f36e25510 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -59,7 +59,7 @@
         wrapper.appendChild(box);
         box.appendChild(el);
       });
-    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -236,6 +236,16 @@ quickSort([4, 1, 3, 2], true); // [4,3,2,1]
 
remove([1, 2, 3, 4], n => n % 2 == 0); // [2, 4]
 

sample
Returns a random element from an array.
Use Math.random() to generate a random number, multiply it by length and round it of to the nearest whole number using Math.floor(). This method also works with strings.
const sample = arr => arr[Math.floor(Math.random() * arr.length)];
 
sample([3, 7, 9, 11]); // 9
+

sampleSize
Gets n random elements at unique keys from array up to the size of array.
Shuffle the array using the Fisher-Yates algorithm. Use Array.slice() to get the first n elements. Omit the second argument, n to get only one element at random from the array.
const sampleSize = ([...arr], n = 1) => {
+  let m = arr.length;
+  while (m) {
+    const i = Math.floor(Math.random() * m--);
+    [arr[m], arr[i]] = [arr[i], arr[m]];
+  }
+  return arr.slice(0, n);
+};
+
sampleSize([1, 2, 3], 2); // [3,1]
+sampleSize([1, 2, 3], 4); // [2,3,1]
 

shuffle
Randomizes the order of the values of an array, returning a new array.
Uses the Fisher-Yates algoritm to reorder the elements of the array, based on the Lodash implementation, but as a pure function.
const shuffle = ([...arr]) => {
   let m = arr.length;
   while (m) {
@@ -905,14 +915,4 @@ console.log(sdbm('age')); // 808122783
 yesNo('yes'); // true
 yesNo('No'); // false
 yesNo('Foo', true); // true
-

Uncategorized
sampleSize
Gets n random elements at unique keys from array up to the size of array.
Shuffle the array using the Fisher-Yates algorithm. Use Array.slice() to get the first n elements. Omit the second argument, n to get only one element at random from the array.
const sampleSize = ([...arr], n = 1) => {
-  let m = arr.length;
-  while (m) {
-    const i = Math.floor(Math.random() * m--);
-    [arr[m], arr[i]] = [arr[i], arr[m]];
-  }
-  return arr.slice(0, n);
-};
-
sampleSize([1, 2, 3], 2); // [3,1]
-sampleSize([1, 2, 3], 4); // [2,3,1]
 


\ No newline at end of file

From 0440bc9d8c43e468d8e77504e368d1975891613c Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 14:20:21 +0200
Subject: [PATCH 18/62] Add isPromise snippet

---
 snippets/isPromise.md | 16 ++++++++++++++++
 tag_database          |  1 +
 2 files changed, 17 insertions(+)
 create mode 100644 snippets/isPromise.md

diff --git a/snippets/isPromise.md b/snippets/isPromise.md
new file mode 100644
index 000000000..7a6e32d3f
--- /dev/null
+++ b/snippets/isPromise.md
@@ -0,0 +1,16 @@
+### isPromise
+
+Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise.
+
+Check if the object is not `null`, its `typeof` matches either `object` or `function` and if it has a `.then` property, which is also a `function`.
+
+```js
+const isPromise = obj =>
+  obj !== null && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
+```
+
+```js
+isPromise({then:function () {return ''}}); // true
+isPromise(null); // false
+isPromise({}); // false
+```
diff --git a/tag_database b/tag_database
index e2bb75c7e..5c9edee5d 100644
--- a/tag_database
+++ b/tag_database
@@ -73,6 +73,7 @@ isFunction:utility
 isNull:utility
 isNumber:utility
 isPrime:math
+isPromise:utility
 isString:utility
 isSymbol:utility
 JSONToDate:date

From 5f7c632669f2f49aa7c0cd8b4c4ae2ae442af9c2 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 14:25:43 +0200
Subject: [PATCH 19/62] Update and rename isPromise.md to isPromiseLike.md

---
 snippets/{isPromise.md => isPromiseLike.md} | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
 rename snippets/{isPromise.md => isPromiseLike.md} (73%)

diff --git a/snippets/isPromise.md b/snippets/isPromiseLike.md
similarity index 73%
rename from snippets/isPromise.md
rename to snippets/isPromiseLike.md
index 7a6e32d3f..d7bb9a75b 100644
--- a/snippets/isPromise.md
+++ b/snippets/isPromiseLike.md
@@ -1,16 +1,16 @@
-### isPromise
+### isPromiseLike
 
 Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise.
 
 Check if the object is not `null`, its `typeof` matches either `object` or `function` and if it has a `.then` property, which is also a `function`.
 
 ```js
-const isPromise = obj =>
+const isPromiseLike = obj =>
   obj !== null && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
 ```
 
 ```js
-isPromise({then:function () {return ''}}); // true
-isPromise(null); // false
-isPromise({}); // false
+isPromiseLike({then:function () {return ''}}); // true
+isPromiseLike(null); // false
+isPromiseLike({}); // false
 ```

From ad083ccc5fb06fbb561ce2f10210506c8489d75f Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 14:25:55 +0200
Subject: [PATCH 20/62] Update tag_database

---
 tag_database | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tag_database b/tag_database
index 5c9edee5d..750f9d0bd 100644
--- a/tag_database
+++ b/tag_database
@@ -73,7 +73,7 @@ isFunction:utility
 isNull:utility
 isNumber:utility
 isPrime:math
-isPromise:utility
+isPromiseLike:utility
 isString:utility
 isSymbol:utility
 JSONToDate:date

From bec7e9edde155751318c7275cb5f973a5892726a Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 14:42:45 +0200
Subject: [PATCH 21/62] Add isAbsoluteURL

---
 snippets/isAbsoluteURL.md | 15 +++++++++++++++
 tag_database              |  1 +
 2 files changed, 16 insertions(+)
 create mode 100644 snippets/isAbsoluteURL.md

diff --git a/snippets/isAbsoluteURL.md b/snippets/isAbsoluteURL.md
new file mode 100644
index 000000000..8f13f5861
--- /dev/null
+++ b/snippets/isAbsoluteURL.md
@@ -0,0 +1,15 @@
+### isAbsoluteURL
+
+Returns `true` if the given string is an absolute URL, `false` otherwise.
+
+Use a regular expression to test if the string is an absolute URL.
+
+```js
+const isAbsoluteURL = str =>  /^[a-z][a-z0-9+.-]*:/.test(str);
+```
+
+```js
+isAbsoluteURL('https://google.com'); // true
+isAbsoluteURL('ftp://www.myserver.net'); // true
+isAbsoluteURL('/foo/bar'); // false
+```
diff --git a/tag_database b/tag_database
index e2bb75c7e..716ff171b 100644
--- a/tag_database
+++ b/tag_database
@@ -64,6 +64,7 @@ initializeArrayWithRange:array
 initializeArrayWithValues:array
 inRange:math
 intersection:array
+isAbsoluteURL:string
 isArmstrongNumber:math
 isArray:utility
 isBoolean:utility

From 4becef44961848cca5a6e18673f4ff385fc8b6dc Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 14:44:49 +0200
Subject: [PATCH 22/62] Removes the ironic capitalization from capitalize's
 title

---
 snippets/capitalize.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/snippets/capitalize.md b/snippets/capitalize.md
index 802bd7a4f..f9a26e7be 100644
--- a/snippets/capitalize.md
+++ b/snippets/capitalize.md
@@ -1,4 +1,4 @@
-### Capitalize
+### capitalize
 
 Capitalizes the first letter of a string.
 

From d5b7fca072f33e124fd1ff6fccf3dace7a76928e Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 12:45:44 +0000
Subject: [PATCH 23/62] Travis build: 720 [ci skip]

---
 README.md       | 2 +-
 docs/index.html | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 6659888fa..036edc432 100644
--- a/README.md
+++ b/README.md
@@ -3418,7 +3418,7 @@ byteSize('Hello World'); // 11
 
[⬆ Back to top](#table-of-contents)
 
 
-### Capitalize
+### capitalize
 
 Capitalizes the first letter of a string.
 
diff --git a/docs/index.html b/docs/index.html
index f36e25510..5c06dd1eb 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -690,7 +690,7 @@ size({ one: 1, two: 2, three: 3 }); // 3
 

byteSize
Returns the length of string.
Convert a given string to a Blob Object and find its size.
const byteSize = str => new Blob([str]).size;
 
byteSize('😀'); // 4
 byteSize('Hello World'); // 11
-

Capitalize
Capitalizes the first letter of a string.
Use destructuring and toUpperCase() to capitalize first letter, ...rest to get array of characters after first letter and then Array.join('') to make it a string again. Omit the lowerRest parameter to keep the rest of the string intact, or set it to true to convert to lowercase.
const capitalize = ([first, ...rest], lowerRest = false) =>
+

capitalize
Capitalizes the first letter of a string.
Use destructuring and toUpperCase() to capitalize first letter, ...rest to get array of characters after first letter and then Array.join('') to make it a string again. Omit the lowerRest parameter to keep the rest of the string intact, or set it to true to convert to lowercase.
const capitalize = ([first, ...rest], lowerRest = false) =>
   first.toUpperCase() + (lowerRest ? rest.join('').toLowerCase() : rest.join(''));
 
capitalize('fooBar'); // 'FooBar'
 capitalize('fooBar', true); // 'Foobar'

From b16204e5e0f9fa679e3487d8fb5fe07b2e449fa0 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 13:06:22 +0000
Subject: [PATCH 24/62] Travis build: 727 [ci skip]

---
 README.md               | 63 +++++++++++++++++++++++++++++++++++++++++
 docs/index.html         | 23 ++++++++++++++-
 snippets/isArrayLike.md | 13 ++++-----
 snippets/isValidJSON.md |  7 ++---
 tag_database            |  2 ++
 5 files changed, 96 insertions(+), 12 deletions(-)

diff --git a/README.md b/README.md
index 036edc432..f2b0a62bc 100644
--- a/README.md
+++ b/README.md
@@ -261,6 +261,16 @@
 
 
 
+### _Uncategorized_
+
+

+View contents
+
+* [`isArrayLike`](#isarraylike)
+* [`isValidJSON`](#isvalidjson)
+
+

+
 ---
  ## 🔌 Adapter
 
@@ -4394,6 +4404,59 @@ yesNo('Foo', true); // true
 
 
[⬆ Back to top](#table-of-contents)
 
+---
+ ## _Uncategorized_
+
+### isArrayLike
+
+Checks if the provided argument is array-like (i.e. is iterable).
+
+Use `Array.from()` and a `try... catch` block to check if the provided argument is array-like.
+
+```js
+const isArrayLike = arr => {
+  try {
+    Array.from(arr);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+```
+
+```js
+isArrayLike(document.querySelector('.className')); // true
+isArrayLike('abc'); // true
+isArrayLike(null); // false
+```
+
+
[⬆ back to top](#table-of-contents)
+
+
+### isValidJSON
+
+Checks if the provided argument is a valid JSON.
+
+Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
+
+```js
+const isValidJSON = obj => {
+  try {
+    JSON.parse(obj);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+```
+
+```js
+isValidJSON('{"name":"Adam","age":20}'); // true
+isValidJSON('{"name":"Adam",age:"20"}'); // false
+```
+
+
[⬆ back to top](#table-of-contents)
+
 
 ## Collaborators
 
diff --git a/docs/index.html b/docs/index.html
index 5c06dd1eb..ebbc9bc33 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -59,7 +59,7 @@
         wrapper.appendChild(box);
         box.appendChild(el);
       });
-    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -915,4 +915,25 @@ console.log(sdbm('age')); // 808122783
 yesNo('yes'); // true
 yesNo('No'); // false
 yesNo('Foo', true); // true
+

Uncategorized
isArrayLike
Checks if the provided argument is array-like (i.e. is iterable).
Use Array.from() and a try... catch block to check if the provided argument is array-like.
const isArrayLike = arr => {
+  try {
+    Array.from(arr);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+
isArrayLike(document.querySelector('.className')); // true
+isArrayLike('abc'); // true
+isArrayLike(null); // false
+

isValidJSON
Checks if the provided argument is a valid JSON.
Use JSON.parse() and a try... catch block to check if the provided argument is a valid JSON.
const isValidJSON = obj => {
+  try {
+    JSON.parse(obj);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+
isValidJSON('{"name":"Adam","age":20}'); // true
+isValidJSON('{"name":"Adam",age:"20"}'); // false
 


\ No newline at end of file
diff --git a/snippets/isArrayLike.md b/snippets/isArrayLike.md
index 83c8acb81..36eae12a9 100644
--- a/snippets/isArrayLike.md
+++ b/snippets/isArrayLike.md
@@ -6,18 +6,17 @@ Use `Array.from()` and a `try... catch` block to check if the provided argument
 
 ```js
 const isArrayLike = arr => {
-  try{
+  try {
     Array.from(arr);
     return true;
-  }
-  catch(e){
+  } catch (e) {
     return false;
   }
-}
+};
 ```
 
 ```js
-isArrayLike(document.querySelector('.className')) // true
-isArrayLike('abc') // true
-isArrayLike(null) // false
+isArrayLike(document.querySelector('.className')); // true
+isArrayLike('abc'); // true
+isArrayLike(null); // false
 ```
diff --git a/snippets/isValidJSON.md b/snippets/isValidJSON.md
index 56211961b..e9898caee 100644
--- a/snippets/isValidJSON.md
+++ b/snippets/isValidJSON.md
@@ -6,14 +6,13 @@ Use `JSON.parse()` and a `try... catch` block to check if the provided argument
 
 ```js
 const isValidJSON = obj => {
-  try{
+  try {
     JSON.parse(obj);
     return true;
-  }
-  catch(e){
+  } catch (e) {
     return false;
   }
-}
+};
 ```
 
 ```js
diff --git a/tag_database b/tag_database
index e2bb75c7e..c02508fff 100644
--- a/tag_database
+++ b/tag_database
@@ -66,6 +66,7 @@ inRange:math
 intersection:array
 isArmstrongNumber:math
 isArray:utility
+isArrayLike:uncategorized
 isBoolean:utility
 isDivisible:math
 isEven:math
@@ -75,6 +76,7 @@ isNumber:utility
 isPrime:math
 isString:utility
 isSymbol:utility
+isValidJSON:uncategorized
 JSONToDate:date
 JSONToFile:node
 last:array

From f5dc73e29a55d2c65188c2fcfdba7282a08d56f9 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 15:06:53 +0200
Subject: [PATCH 25/62] Update tag_database

---
 tag_database | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tag_database b/tag_database
index c02508fff..38dc36791 100644
--- a/tag_database
+++ b/tag_database
@@ -66,7 +66,7 @@ inRange:math
 intersection:array
 isArmstrongNumber:math
 isArray:utility
-isArrayLike:uncategorized
+isArrayLike:utility
 isBoolean:utility
 isDivisible:math
 isEven:math
@@ -76,7 +76,7 @@ isNumber:utility
 isPrime:math
 isString:utility
 isSymbol:utility
-isValidJSON:uncategorized
+isValidJSON:utility
 JSONToDate:date
 JSONToFile:node
 last:array

From e9321cfb1aa5ed87a5b134e40d800b3c17a782df Mon Sep 17 00:00:00 2001
From: Rohit Tanwar <31792358+kriadmin@users.noreply.github.com>
Date: Sun, 31 Dec 2017 18:38:09 +0530
Subject: [PATCH 26/62] Update isValidJSON.md

---
 snippets/isValidJSON.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/snippets/isValidJSON.md b/snippets/isValidJSON.md
index e9898caee..76257a007 100644
--- a/snippets/isValidJSON.md
+++ b/snippets/isValidJSON.md
@@ -8,8 +8,10 @@ Use `JSON.parse()` and a `try... catch` block to check if the provided argument
 const isValidJSON = obj => {
   try {
     JSON.parse(obj);
-    return true;
-  } catch (e) {
+    if (o && typeof o === "object") {
+            return true;
+        }
+} catch (e) {
     return false;
   }
 };

From d9b34306309cc83bff31e24d526247ff54dfe049 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 13:08:25 +0000
Subject: [PATCH 27/62] Travis build: 728 [ci skip]

---
 README.md       | 126 ++++++++++++++++++++++++------------------------
 docs/index.html |  44 ++++++++---------
 2 files changed, 85 insertions(+), 85 deletions(-)

diff --git a/README.md b/README.md
index f2b0a62bc..cb94d656d 100644
--- a/README.md
+++ b/README.md
@@ -244,12 +244,14 @@
 * [`getType`](#gettype)
 * [`hexToRGB`](#hextorgb)
 * [`isArray`](#isarray)
+* [`isArrayLike`](#isarraylike)
 * [`isBoolean`](#isboolean)
 * [`isFunction`](#isfunction)
 * [`isNull`](#isnull)
 * [`isNumber`](#isnumber)
 * [`isString`](#isstring)
 * [`isSymbol`](#issymbol)
+* [`isValidJSON`](#isvalidjson)
 * [`randomHexColorCode`](#randomhexcolorcode)
 * [`RGBToHex`](#rgbtohex)
 * [`sdbm`](#sdbm)
@@ -261,16 +263,6 @@
 
 
 
-### _Uncategorized_
-
-

-View contents
-
-* [`isArrayLike`](#isarraylike)
-* [`isValidJSON`](#isvalidjson)
-
-

-
 ---
  ## 🔌 Adapter
 
@@ -4057,6 +4049,37 @@ isArray([1]); // true
 
[⬆ Back to top](#table-of-contents)
 
 
+### isArrayLike
+
+Checks if the provided argument is array-like (i.e. is iterable).
+
+Use `Array.from()` and a `try... catch` block to check if the provided argument is array-like.
+
+```js
+const isArrayLike = arr => {
+  try {
+    Array.from(arr);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+```
+
+

+Examples
+
+```js
+isArrayLike(document.querySelector('.className')); // true
+isArrayLike('abc'); // true
+isArrayLike(null); // false
+```
+
+

+
+
[⬆ Back to top](#table-of-contents)
+
+
 ### isBoolean
 
 Checks if the given argument is a native boolean element.
@@ -4194,6 +4217,36 @@ isSymbol(Symbol('x')); // true
 
[⬆ Back to top](#table-of-contents)
 
 
+### isValidJSON
+
+Checks if the provided argument is a valid JSON.
+
+Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
+
+```js
+const isValidJSON = obj => {
+  try {
+    JSON.parse(obj);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+```
+
+

+Examples
+
+```js
+isValidJSON('{"name":"Adam","age":20}'); // true
+isValidJSON('{"name":"Adam",age:"20"}'); // false
+```
+
+

+
+
[⬆ Back to top](#table-of-contents)
+
+
 ### randomHexColorCode
 
 Generates a random hexadecimal color code.
@@ -4404,59 +4457,6 @@ yesNo('Foo', true); // true
 
 
[⬆ Back to top](#table-of-contents)
 
----
- ## _Uncategorized_
-
-### isArrayLike
-
-Checks if the provided argument is array-like (i.e. is iterable).
-
-Use `Array.from()` and a `try... catch` block to check if the provided argument is array-like.
-
-```js
-const isArrayLike = arr => {
-  try {
-    Array.from(arr);
-    return true;
-  } catch (e) {
-    return false;
-  }
-};
-```
-
-```js
-isArrayLike(document.querySelector('.className')); // true
-isArrayLike('abc'); // true
-isArrayLike(null); // false
-```
-
-
[⬆ back to top](#table-of-contents)
-
-
-### isValidJSON
-
-Checks if the provided argument is a valid JSON.
-
-Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
-
-```js
-const isValidJSON = obj => {
-  try {
-    JSON.parse(obj);
-    return true;
-  } catch (e) {
-    return false;
-  }
-};
-```
-
-```js
-isValidJSON('{"name":"Adam","age":20}'); // true
-isValidJSON('{"name":"Adam",age:"20"}'); // false
-```
-
-
[⬆ back to top](#table-of-contents)
-
 
 ## Collaborators
 
diff --git a/docs/index.html b/docs/index.html
index ebbc9bc33..a46afcda6 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -59,7 +59,7 @@
         wrapper.appendChild(box);
         box.appendChild(el);
       });
-    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -849,6 +849,17 @@ hexToRGB('#fff'); // 'rgb(255, 255, 255)'
 

isArray
Checks if the given argument is an array.
Use Array.isArray() to check if a value is classified as an array.
const isArray = val => !!val && Array.isArray(val);
 
isArray(null); // false
 isArray([1]); // true
+

isArrayLike
Checks if the provided argument is array-like (i.e. is iterable).
Use Array.from() and a try... catch block to check if the provided argument is array-like.
const isArrayLike = arr => {
+  try {
+    Array.from(arr);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+
isArrayLike(document.querySelector('.className')); // true
+isArrayLike('abc'); // true
+isArrayLike(null); // false
 

isBoolean
Checks if the given argument is a native boolean element.
Use typeof to check if a value is classified as a boolean primitive.
const isBoolean = val => typeof val === 'boolean';
 
isBoolean(null); // false
 isBoolean(false); // true
@@ -867,6 +878,16 @@ isString('10'); // true
 

isSymbol
Checks if the given argument is a symbol.
Use typeof to check if a value is classified as a symbol primitive.
const isSymbol = val => typeof val === 'symbol';
 
isSymbol('x'); // false
 isSymbol(Symbol('x')); // true
+

isValidJSON
Checks if the provided argument is a valid JSON.
Use JSON.parse() and a try... catch block to check if the provided argument is a valid JSON.
const isValidJSON = obj => {
+  try {
+    JSON.parse(obj);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+
isValidJSON('{"name":"Adam","age":20}'); // true
+isValidJSON('{"name":"Adam",age:"20"}'); // false
 

randomHexColorCode
Generates a random hexadecimal color code.
Use Math.random to generate a random 24-bit(6x4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal String using toString(16).
const randomHexColorCode = () => {
   let n = ((Math.random() * 0xfffff) | 0).toString(16);
   return '#' + (n.length !== 6 ? ((Math.random() * 0xf) | 0).toString(16) + n : n);
@@ -915,25 +936,4 @@ console.log(sdbm('age')); // 808122783
 yesNo('yes'); // true
 yesNo('No'); // false
 yesNo('Foo', true); // true
-

Uncategorized
isArrayLike
Checks if the provided argument is array-like (i.e. is iterable).
Use Array.from() and a try... catch block to check if the provided argument is array-like.
const isArrayLike = arr => {
-  try {
-    Array.from(arr);
-    return true;
-  } catch (e) {
-    return false;
-  }
-};
-
isArrayLike(document.querySelector('.className')); // true
-isArrayLike('abc'); // true
-isArrayLike(null); // false
-

isValidJSON
Checks if the provided argument is a valid JSON.
Use JSON.parse() and a try... catch block to check if the provided argument is a valid JSON.
const isValidJSON = obj => {
-  try {
-    JSON.parse(obj);
-    return true;
-  } catch (e) {
-    return false;
-  }
-};
-
isValidJSON('{"name":"Adam","age":20}'); // true
-isValidJSON('{"name":"Adam",age:"20"}'); // false
 


\ No newline at end of file

From d9e2bd404217ff16f80996e93cebc6801a5a3a1a Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 15:12:16 +0200
Subject: [PATCH 28/62] Update isValidJSON.md

---
 snippets/isValidJSON.md | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/snippets/isValidJSON.md b/snippets/isValidJSON.md
index 76257a007..dadefb897 100644
--- a/snippets/isValidJSON.md
+++ b/snippets/isValidJSON.md
@@ -2,15 +2,13 @@
 
 Checks if the provided argument is a valid JSON.
 
-Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
+Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON and non-null.
 
 ```js
 const isValidJSON = obj => {
   try {
     JSON.parse(obj);
-    if (o && typeof o === "object") {
-            return true;
-        }
+    return !!obj;
 } catch (e) {
     return false;
   }

From 2096316c55ae30f4643670bb251c0e03ded69e98 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 13:15:55 +0000
Subject: [PATCH 29/62] Travis build: 732 [ci skip]

---
 README.md                 | 29 +++++++++++++++++++++++++++--
 docs/index.html           | 10 +++++++---
 snippets/isAbsoluteURL.md |  2 +-
 snippets/isValidJSON.md   |  2 +-
 4 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index cb94d656d..477bd5b8d 100644
--- a/README.md
+++ b/README.md
@@ -219,6 +219,7 @@
 * [`escapeHTML`](#escapehtml)
 * [`escapeRegExp`](#escaperegexp)
 * [`fromCamelCase`](#fromcamelcase)
+* [`isAbsoluteURL`](#isabsoluteurl)
 * [`palindrome`](#palindrome)
 * [`repeatString`](#repeatstring)
 * [`reverseString`](#reversestring)
@@ -3574,6 +3575,30 @@ fromCamelCase('someJavascriptProperty', '_'); // 'some_javascript_property'
 
[⬆ Back to top](#table-of-contents)
 
 
+### isAbsoluteURL
+
+Returns `true` if the given string is an absolute URL, `false` otherwise.
+
+Use a regular expression to test if the string is an absolute URL.
+
+```js
+const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);
+```
+
+

+Examples
+
+```js
+isAbsoluteURL('https://google.com'); // true
+isAbsoluteURL('ftp://www.myserver.net'); // true
+isAbsoluteURL('/foo/bar'); // false
+```
+
+

+
+
[⬆ Back to top](#table-of-contents)
+
+
 ### palindrome
 
 Returns `true` if the given string is a palindrome, `false` otherwise.
@@ -4221,13 +4246,13 @@ isSymbol(Symbol('x')); // true
 
 Checks if the provided argument is a valid JSON.
 
-Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
+Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON and non-null.
 
 ```js
 const isValidJSON = obj => {
   try {
     JSON.parse(obj);
-    return true;
+    return !!obj;
   } catch (e) {
     return false;
   }
diff --git a/docs/index.html b/docs/index.html
index a46afcda6..fcffcb709 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -59,7 +59,7 @@
         wrapper.appendChild(box);
         box.appendChild(el);
       });
-    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -722,6 +722,10 @@ countVowels('gym'); // 0
 
fromCamelCase('someDatabaseFieldName', ' '); // 'some database field name'
 fromCamelCase('someLabelThatNeedsToBeCamelized', '-'); // 'some-label-that-needs-to-be-camelized'
 fromCamelCase('someJavascriptProperty', '_'); // 'some_javascript_property'
+

isAbsoluteURL
Returns true if the given string is an absolute URL, false otherwise.
Use a regular expression to test if the string is an absolute URL.
const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);
+
isAbsoluteURL('https://google.com'); // true
+isAbsoluteURL('ftp://www.myserver.net'); // true
+isAbsoluteURL('/foo/bar'); // false
 

palindrome
Returns true if the given string is a palindrome, false otherwise.
Convert string toLowerCase() and use replace() to remove non-alphanumeric characters from it. Then, split('') into individual characters, reverse(), join('') and compare to the original, unreversed string, after converting it tolowerCase().
const palindrome = str => {
   const s = str.toLowerCase().replace(/[\W_]/g, '');
   return (
@@ -878,10 +882,10 @@ isString('10'); // true
 

isSymbol
Checks if the given argument is a symbol.
Use typeof to check if a value is classified as a symbol primitive.
const isSymbol = val => typeof val === 'symbol';
 
isSymbol('x'); // false
 isSymbol(Symbol('x')); // true
-

isValidJSON
Checks if the provided argument is a valid JSON.
Use JSON.parse() and a try... catch block to check if the provided argument is a valid JSON.
const isValidJSON = obj => {
+

isValidJSON
Checks if the provided argument is a valid JSON.
Use JSON.parse() and a try... catch block to check if the provided argument is a valid JSON and non-null.
const isValidJSON = obj => {
   try {
     JSON.parse(obj);
-    return true;
+    return !!obj;
   } catch (e) {
     return false;
   }
diff --git a/snippets/isAbsoluteURL.md b/snippets/isAbsoluteURL.md
index 8f13f5861..00d8d8936 100644
--- a/snippets/isAbsoluteURL.md
+++ b/snippets/isAbsoluteURL.md
@@ -5,7 +5,7 @@ Returns `true` if the given string is an absolute URL, `false` otherwise.
 Use a regular expression to test if the string is an absolute URL.
 
 ```js
-const isAbsoluteURL = str =>  /^[a-z][a-z0-9+.-]*:/.test(str);
+const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);
 ```
 
 ```js
diff --git a/snippets/isValidJSON.md b/snippets/isValidJSON.md
index dadefb897..ed7672a3a 100644
--- a/snippets/isValidJSON.md
+++ b/snippets/isValidJSON.md
@@ -9,7 +9,7 @@ const isValidJSON = obj => {
   try {
     JSON.parse(obj);
     return !!obj;
-} catch (e) {
+  } catch (e) {
     return false;
   }
 };

From 4774d42eb7ab2a1b634979c9f425f18bf1e7b7b1 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 15:17:27 +0200
Subject: [PATCH 30/62] Update isValidJSON.md

---
 snippets/isValidJSON.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/snippets/isValidJSON.md b/snippets/isValidJSON.md
index ed7672a3a..5b671e67b 100644
--- a/snippets/isValidJSON.md
+++ b/snippets/isValidJSON.md
@@ -2,13 +2,13 @@
 
 Checks if the provided argument is a valid JSON.
 
-Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON and non-null.
+Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
 
 ```js
 const isValidJSON = obj => {
   try {
     JSON.parse(obj);
-    return !!obj;
+    return true;
   } catch (e) {
     return false;
   }
@@ -18,4 +18,5 @@ const isValidJSON = obj => {
 ```js
 isValidJSON('{"name":"Adam","age":20}'); // true
 isValidJSON('{"name":"Adam",age:"20"}'); // false
+isValidJSON(null) // true
 ```

From 92fbafdc5d8ac6f112e1f4fadc5fc005d4a526b7 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 13:18:31 +0000
Subject: [PATCH 31/62] Travis build: 733 [ci skip]

---
 README.md               | 5 +++--
 docs/index.html         | 5 +++--
 snippets/isValidJSON.md | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 477bd5b8d..d980e1337 100644
--- a/README.md
+++ b/README.md
@@ -4246,13 +4246,13 @@ isSymbol(Symbol('x')); // true
 
 Checks if the provided argument is a valid JSON.
 
-Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON and non-null.
+Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
 
 ```js
 const isValidJSON = obj => {
   try {
     JSON.parse(obj);
-    return !!obj;
+    return true;
   } catch (e) {
     return false;
   }
@@ -4265,6 +4265,7 @@ const isValidJSON = obj => {
 ```js
 isValidJSON('{"name":"Adam","age":20}'); // true
 isValidJSON('{"name":"Adam",age:"20"}'); // false
+isValidJSON(null); // true
 ```
 
 
diff --git a/docs/index.html b/docs/index.html
index fcffcb709..9571d93b4 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -882,16 +882,17 @@ isString('10'); // true
 

isSymbol
Checks if the given argument is a symbol.
Use typeof to check if a value is classified as a symbol primitive.
const isSymbol = val => typeof val === 'symbol';
 
isSymbol('x'); // false
 isSymbol(Symbol('x')); // true
-

isValidJSON
Checks if the provided argument is a valid JSON.
Use JSON.parse() and a try... catch block to check if the provided argument is a valid JSON and non-null.
const isValidJSON = obj => {
+

isValidJSON
Checks if the provided argument is a valid JSON.
Use JSON.parse() and a try... catch block to check if the provided argument is a valid JSON.
const isValidJSON = obj => {
   try {
     JSON.parse(obj);
-    return !!obj;
+    return true;
   } catch (e) {
     return false;
   }
 };
 
isValidJSON('{"name":"Adam","age":20}'); // true
 isValidJSON('{"name":"Adam",age:"20"}'); // false
+isValidJSON(null); // true
 

randomHexColorCode
Generates a random hexadecimal color code.
Use Math.random to generate a random 24-bit(6x4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal String using toString(16).
const randomHexColorCode = () => {
   let n = ((Math.random() * 0xfffff) | 0).toString(16);
   return '#' + (n.length !== 6 ? ((Math.random() * 0xf) | 0).toString(16) + n : n);
diff --git a/snippets/isValidJSON.md b/snippets/isValidJSON.md
index 5b671e67b..51b9270a2 100644
--- a/snippets/isValidJSON.md
+++ b/snippets/isValidJSON.md
@@ -18,5 +18,5 @@ const isValidJSON = obj => {
 ```js
 isValidJSON('{"name":"Adam","age":20}'); // true
 isValidJSON('{"name":"Adam",age:"20"}'); // false
-isValidJSON(null) // true
+isValidJSON(null); // true
 ```

From 3131e7027efcc8f8fbc32722d64894b0bec0ef10 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 13:54:58 +0000
Subject: [PATCH 32/62] Travis build: 734 [ci skip]

---
 README.md                 | 32 ++++++++++++++++++++++++++++++++
 docs/index.html           | 13 ++++++++++++-
 snippets/isPromiseLike.md | 10 ++++++++--
 3 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index d980e1337..82c18d2cf 100644
--- a/README.md
+++ b/README.md
@@ -250,6 +250,7 @@
 * [`isFunction`](#isfunction)
 * [`isNull`](#isnull)
 * [`isNumber`](#isnumber)
+* [`isPromiseLike`](#ispromiselike)
 * [`isString`](#isstring)
 * [`isSymbol`](#issymbol)
 * [`isValidJSON`](#isvalidjson)
@@ -4196,6 +4197,37 @@ isNumber(1); // true
 
[⬆ Back to top](#table-of-contents)
 
 
+### isPromiseLike
+
+Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise.
+
+Check if the object is not `null`, its `typeof` matches either `object` or `function` and if it has a `.then` property, which is also a `function`.
+
+```js
+const isPromiseLike = obj =>
+  obj !== null &&
+  (typeof obj === 'object' || typeof obj === 'function') &&
+  typeof obj.then === 'function';
+```
+
+

+Examples
+
+```js
+isPromiseLike({
+  then: function() {
+    return '';
+  }
+}); // true
+isPromiseLike(null); // false
+isPromiseLike({}); // false
+```
+
+

+
+
[⬆ Back to top](#table-of-contents)
+
+
 ### isString
 
 Checks if the given argument is a string.
diff --git a/docs/index.html b/docs/index.html
index 9571d93b4..22e389e92 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -59,7 +59,7 @@
         wrapper.appendChild(box);
         box.appendChild(el);
       });
-    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -876,6 +876,17 @@ isNull('null'); // false
 

isNumber
Checks if the given argument is a number.
Use typeof to check if a value is classified as a number primitive.
const isNumber = val => typeof val === 'number';
 
isNumber('1'); // false
 isNumber(1); // true
+

isPromiseLike
Returns true if an object looks like a Promise, false otherwise.
Check if the object is not null, its typeof matches either object or function and if it has a .then property, which is also a function.
const isPromiseLike = obj =>
+  obj !== null &&
+  (typeof obj === 'object' || typeof obj === 'function') &&
+  typeof obj.then === 'function';
+
isPromiseLike({
+  then: function() {
+    return '';
+  }
+}); // true
+isPromiseLike(null); // false
+isPromiseLike({}); // false
 

isString
Checks if the given argument is a string.
Use typeof to check if a value is classified as a string primitive.
const isString = val => typeof val === 'string';
 
isString(10); // false
 isString('10'); // true
diff --git a/snippets/isPromiseLike.md b/snippets/isPromiseLike.md
index d7bb9a75b..6a2ae29d4 100644
--- a/snippets/isPromiseLike.md
+++ b/snippets/isPromiseLike.md
@@ -6,11 +6,17 @@ Check if the object is not `null`, its `typeof` matches either `object` or `func
 
 ```js
 const isPromiseLike = obj =>
-  obj !== null && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
+  obj !== null &&
+  (typeof obj === 'object' || typeof obj === 'function') &&
+  typeof obj.then === 'function';
 ```
 
 ```js
-isPromiseLike({then:function () {return ''}}); // true
+isPromiseLike({
+  then: function() {
+    return '';
+  }
+}); // true
 isPromiseLike(null); // false
 isPromiseLike({}); // false
 ```

From 92e67e7fc373dd6c5b59cfa600b2ba7e013f805c Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 15:16:08 +0000
Subject: [PATCH 33/62] Travis build: 740 [ci skip]

---
 README.md               | 34 ++++++++++++++++++++++++++++++++++
 docs/index.html         |  9 ++++++++-
 snippets/sortedIndex.md |  6 +++---
 tag_database            |  1 +
 4 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 82c18d2cf..e1864745a 100644
--- a/README.md
+++ b/README.md
@@ -265,6 +265,15 @@
 
 
 
+### _Uncategorized_
+
+

+View contents
+
+* [`sortedIndex`](#sortedindex)
+
+

+
 ---
  ## 🔌 Adapter
 
@@ -4515,6 +4524,31 @@ yesNo('Foo', true); // true
 
 
[⬆ Back to top](#table-of-contents)
 
+---
+ ## _Uncategorized_
+
+### sortedIndex
+
+Returns the lowest index at which value should be inserted into array in order to maintain its sort order.
+
+Check if the array is sorted in descending order (loosely).
+Use `Array.findIndex()` to find the appropriate index where the element should be inserted.
+
+```js
+const sortedIndex = (arr, n) => {
+  const isDescending = arr[0] > arr[arr.length - 1];
+  const index = arr.findIndex(el => (isDescending ? n >= el : n <= el));
+  return index === -1 ? arr.length : index;
+};
+```
+
+```js
+sortedIndex([5, 3, 2, 1], 4); // 1
+sortedIndex([30, 50], 40); // 1
+```
+
+
[⬆ back to top](#table-of-contents)
+
 
 ## Collaborators
 
diff --git a/docs/index.html b/docs/index.html
index 22e389e92..c6dcd331c 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -59,7 +59,7 @@
         wrapper.appendChild(box);
         box.appendChild(el);
       });
-    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
+    }
 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -952,4 +952,11 @@ console.log(sdbm('age')); // 808122783
 yesNo('yes'); // true
 yesNo('No'); // false
 yesNo('Foo', true); // true
+

Uncategorized
sortedIndex
Returns the lowest index at which value should be inserted into array in order to maintain its sort order.
Check if the array is sorted in descending order (loosely). Use Array.findIndex() to find the appropriate index where the element should be inserted.
const sortedIndex = (arr, n) => {
+  const isDescending = arr[0] > arr[arr.length - 1];
+  const index = arr.findIndex(el => (isDescending ? n >= el : n <= el));
+  return index === -1 ? arr.length : index;
+};
+
sortedIndex([5, 3, 2, 1], 4); // 1
+sortedIndex([30, 50], 40); // 1
 


\ No newline at end of file
diff --git a/snippets/sortedIndex.md b/snippets/sortedIndex.md
index f83da6ec0..e8d6a6d86 100644
--- a/snippets/sortedIndex.md
+++ b/snippets/sortedIndex.md
@@ -8,12 +8,12 @@ Use `Array.findIndex()` to find the appropriate index where the element should b
 ```js
 const sortedIndex = (arr, n) => {
   const isDescending = arr[0] > arr[arr.length - 1];
-  const index = arr.findIndex(el => isDescending ? n >= el : n <= el);
+  const index = arr.findIndex(el => (isDescending ? n >= el : n <= el));
   return index === -1 ? arr.length : index;
 };
 ```
 
 ```js
-sortedIndex([5,3,2,1], 4); // 1
-sortedIndex([30,50],40); // 1
+sortedIndex([5, 3, 2, 1], 4); // 1
+sortedIndex([30, 50], 40); // 1
 ```
diff --git a/tag_database b/tag_database
index 82a224942..7e280efbd 100644
--- a/tag_database
+++ b/tag_database
@@ -130,6 +130,7 @@ similarity:array
 size:object
 sleep:function
 sortCharactersInString:string
+sortedIndex:uncategorized
 speechSynthesis:browser
 splitLines:string
 spreadOver:adapter

From cee21bc6a2ded48956fe03c889c5e13863681ead Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 17:18:19 +0200
Subject: [PATCH 34/62] Update isArrayLike.md

---
 snippets/isArrayLike.md | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/snippets/isArrayLike.md b/snippets/isArrayLike.md
index 36eae12a9..ee2fc1718 100644
--- a/snippets/isArrayLike.md
+++ b/snippets/isArrayLike.md
@@ -2,17 +2,11 @@
 
 Checks if the provided argument is array-like (i.e. is iterable).
 
-Use `Array.from()` and a `try... catch` block to check if the provided argument is array-like.
+Check that the object is not a function or `null` and that its `length` property is a non-negative integer below `Number.MAX_SAFE_INTEGER`.
 
 ```js
-const isArrayLike = arr => {
-  try {
-    Array.from(arr);
-    return true;
-  } catch (e) {
-    return false;
-  }
-};
+const isArrayLike = val => 
+  val != null && typeof val != 'function' && val.length > -1 && val.length % 1 == 0 && val.length <= Number.MAX_SAFE_INTEGER;
 ```
 
 ```js

From 4851f68184c606ef839922b3efaa8b27705e444d Mon Sep 17 00:00:00 2001
From: Angelos Chalaris 
Date: Sun, 31 Dec 2017 17:19:36 +0200
Subject: [PATCH 35/62] Fixed example

---
 snippets/isArrayLike.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/snippets/isArrayLike.md b/snippets/isArrayLike.md
index ee2fc1718..051399caf 100644
--- a/snippets/isArrayLike.md
+++ b/snippets/isArrayLike.md
@@ -10,7 +10,7 @@ const isArrayLike = val =>
 ```
 
 ```js
-isArrayLike(document.querySelector('.className')); // true
+isArrayLike(document.querySelectorAll('.className')); // true
 isArrayLike('abc'); // true
 isArrayLike(null); // false
 ```

From bb4a81de1937d941acddb18e30d83cdd8339e165 Mon Sep 17 00:00:00 2001
From: Travis CI 
Date: Sun, 31 Dec 2017 15:49:44 +0000
Subject: [PATCH 36/62] Travis build: 743 [ci skip]

---
 README.md               | 18 ++++++++----------
 docs/index.html         | 16 +++++++---------
 snippets/isArrayLike.md |  8 ++++++--
 3 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/README.md b/README.md
index e1864745a..5092802d3 100644
--- a/README.md
+++ b/README.md
@@ -4088,24 +4088,22 @@ isArray([1]); // true
 
 Checks if the provided argument is array-like (i.e. is iterable).
 
-Use `Array.from()` and a `try... catch` block to check if the provided argument is array-like.
+Check that the object is not a function or `null` and that its `length` property is a non-negative integer below `Number.MAX_SAFE_INTEGER`.
 
 ```js
-const isArrayLike = arr => {
-  try {
-    Array.from(arr);
-    return true;
-  } catch (e) {
-    return false;
-  }
-};
+const isArrayLike = val =>
+  val != null &&
+  typeof val != 'function' &&
+  val.length > -1 &&
+  val.length % 1 == 0 &&
+  val.length <= Number.MAX_SAFE_INTEGER;
 ```
 
 

 Examples
 
 ```js
-isArrayLike(document.querySelector('.className')); // true
+isArrayLike(document.querySelectorAll('.className')); // true
 isArrayLike('abc'); // true
 isArrayLike(null); // false
 ```
diff --git a/docs/index.html b/docs/index.html
index c6dcd331c..fd4c1c019 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -853,15 +853,13 @@ hexToRGB('#fff'); // 'rgb(255, 255, 255)'
 

isArray
Checks if the given argument is an array.
Use Array.isArray() to check if a value is classified as an array.
const isArray = val => !!val && Array.isArray(val);
 
isArray(null); // false
 isArray([1]); // true
-

isArrayLike
Checks if the provided argument is array-like (i.e. is iterable).
Use Array.from() and a try... catch block to check if the provided argument is array-like.
const isArrayLike = arr => {
-  try {
-    Array.from(arr);
-    return true;
-  } catch (e) {
-    return false;
-  }
-};
-
isArrayLike(document.querySelector('.className')); // true
+

isArrayLike
Checks if the provided argument is array-like (i.e. is iterable).
Check that the object is not a function or null and that its length property is a non-negative integer below Number.MAX_SAFE_INTEGER.
const isArrayLike = val =>
+  val != null &&
+  typeof val != 'function' &&
+  val.length > -1 &&
+  val.length % 1 == 0 &&
+  val.length <= Number.MAX_SAFE_INTEGER;
+
isArrayLike(document.querySelectorAll('.className')); // true
 isArrayLike('abc'); // true
 isArrayLike(null); // false
 

isBoolean
Checks if the given argument is a native boolean element.
Use typeof to check if a value is classified as a boolean primitive.
const isBoolean = val => typeof val === 'boolean';
diff --git a/snippets/isArrayLike.md b/snippets/isArrayLike.md
index 051399caf..8d846e68f 100644
--- a/snippets/isArrayLike.md
+++ b/snippets/isArrayLike.md
@@ -5,8 +5,12 @@ Checks if the provided argument is array-like (i.e. is iterable).
 Check that the object is not a function or `null` and that its `length` property is a non-negative integer below `Number.MAX_SAFE_INTEGER`.
 
 ```js
-const isArrayLike = val => 
-  val != null && typeof val != 'function' && val.length > -1 && val.length % 1 == 0 && val.length <= Number.MAX_SAFE_INTEGER;
+const isArrayLike = val =>
+  val != null &&
+  typeof val != 'function' &&
+  val.length > -1 &&
+  val.length % 1 == 0 &&
+  val.length <= Number.MAX_SAFE_INTEGER;
 ```
 
 ```js

From 5caf7bbc5ef96766c95742f906578b654365eaaf Mon Sep 17 00:00:00 2001
From: Pl4gue 
Date: Sun, 31 Dec 2017 17:20:13 +0100
Subject: [PATCH 37/62] Remove unused spans

---
 docs/mini/flavor.scss         | 2 +-
 static-parts/index-start.html | 2 --
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/docs/mini/flavor.scss b/docs/mini/flavor.scss
index 13f369a30..e1a957cb1 100644
--- a/docs/mini/flavor.scss
+++ b/docs/mini/flavor.scss
@@ -121,7 +121,7 @@ code {
   transform: scale(1);  /* Deals with the issue described in #243 */
 }
 pre { font-size: 1rem; border: 0.0625rem solid var(--secondary-border-color); border-radius: var(--universal-border-radius);}
-.group{position:relative;margin-top:2em;margin-bottom:-1em}
+.group{position:relative;margin-top:2em;margin-bottom:1em}
 .search{font-size:14px;margin-top:-.1em;display:block;width:100%;border:none;border-bottom:1px solid var(--nav-link-color)}
 .search:focus{outline:none}
 label#search-label{color:var(--nav-link-color);font-size:18px;font-weight:400;position:absolute;left:5px;top:10px}
diff --git a/static-parts/index-start.html b/static-parts/index-start.html
index 2dd7839c9..0dfd76c9d 100644
--- a/static-parts/index-start.html
+++ b/static-parts/index-start.html
@@ -92,8 +92,6 @@