From c5c0375f2cb59c006e842a3f08d4a749fd180953 Mon Sep 17 00:00:00 2001 From: 30secondsofcode <30secondsofcode@gmail.com> Date: Fri, 3 Aug 2018 19:51:50 +0000 Subject: [PATCH] Travis build: 188 [cron] --- docs/index.html | 47 +- snippet_data/snippets.json | 4 +- test/httpDelete/httpDelete.js | 2 +- test/httpPut/httpPut.js | 12 +- test/indexOfAll/indexOfAll.js | 3 +- test/isSimilar/isSimilar.js | 12 +- .../levenshteinDistance.js | 35 +- test/removeVowels/removeVowels.js | 2 +- test/testlog | 3215 ++++++++--------- 9 files changed, 1627 insertions(+), 1705 deletions(-) diff --git a/docs/index.html b/docs/index.html index 0a3bcecd7..97f4e915e 100644 --- a/docs/index.html +++ b/docs/index.html @@ -1,29 +1,28 @@ -30 seconds of code

logo 30 seconds of code

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

318
snippets

121
contributors

3482
commits

21229
stars

Our philosophy

The core goal of 30 seconds of code is to provide a quality resource for beginner and advanced JavaScript developers alike. We want to help improve the JavaScript ecosystem, by lowering the barrier of entry for newcomers and help seasoned veterans pick up new tricks and remember old ones. In order to achieve this, we have collected hundreds of snippets that can be of use in a wide range of situations. We welcome new contributors and we like fresh ideas, as long as the code is short and easy to grasp in about 30 seconds. The only catch, if you may, is that a few of our snippets are not perfectly optimized for large, enterprise applications and they might not be deemed production-ready.


In order for 30 seconds of code to be as accessible and useful as possible, all of the snippets in the collection are licensed under the CC0-1.0 License, meaning they are absolutely free to use in any project you like. If you like what we do, you can always credit us, but that is not mandatory.


Today's picks

Our sophisticated robot helpers pick new snippets from our collection daily, so that you can discover new snippets to enhance your projects:

none

Returns true if the provided predicate function returns false for all elements in a collection, false otherwise.

Use Array.some() to test if any elements in the collection return true based on fn. Omit the second argument, fn, to use Boolean as a default.

const none = (arr, fn = Boolean) => !arr.some(fn);
-
none([0, 1, 3, 0], x => x == 2); // true
-none([0, 0, 0]); // true
-

percentile

Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value.

Use Array.reduce() to calculate how many numbers are below the value and how many are the same value and apply the percentile formula.

const percentile = (arr, val) =>
-  (100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0)) / arr.length;
-
percentile([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 6); // 55
-

unflattenObject

Unflatten an object with the paths for keys.

Use Object.keys(obj) combined with Array.reduce() to convert flattened path node to a leaf node. If the value of a key contains a dot delimiter (.), use Array.split('.'), string transformations and JSON.parse() to create an object, then Object.assign() to create the leaf node. Otherwise, add the appropriate key-value pair to the accumulator object.

const unflattenObject = obj =>
-  Object.keys(obj).reduce((acc, k) => {
-    if (k.indexOf('.') !== -1) {
-      const keys = k.split('.');
-      Object.assign(
-        acc,
-        JSON.parse(
-          '{' +
-            keys.map((v, i) => (i !== keys.length - 1 ? `"${v}":{` : `"${v}":`)).join('') +
-            obj[k] +
-            '}'.repeat(keys.length)
-        )
-      );
-    } else acc[k] = obj[k];
-    return acc;
-  }, {});
-
unflattenObject({ 'a.b.c': 1, d: 1 }); // { a: { b: { c: 1 } }, d: 1 }
+30 seconds of code
logo 30 seconds of code
Curated collection of useful JavaScript snippets
that you can understand in 30 seconds or less.
318
snippets
121
contributors
3491
commits
21240
stars
Our philosophy
The core goal of 30 seconds of code is to provide a quality resource for beginner and advanced JavaScript developers alike. We want to help improve the JavaScript ecosystem, by lowering the barrier of entry for newcomers and help seasoned veterans pick up new tricks and remember old ones. In order to achieve this, we have collected hundreds of snippets that can be of use in a wide range of situations. We welcome new contributors and we like fresh ideas, as long as the code is short and easy to grasp in about 30 seconds. The only catch, if you may, is that a few of our snippets are not perfectly optimized for large, enterprise applications and they might not be deemed production-ready.

In order for 30 seconds of code to be as accessible and useful as possible, all of the snippets in the collection are licensed under the CC0-1.0 License, meaning they are absolutely free to use in any project you like. If you like what we do, you can always credit us, but that is not mandatory.

Today's picks
Our sophisticated robot helpers pick new snippets from our collection daily, so that you can discover new snippets to enhance your projects:
 
initialize2DArray
Initializes a 2D array of given width and height and value.
Use Array.map() to generate h rows where each is a new array of size w initialize with value. If the value is not provided, default to null.
const initialize2DArray = (w, h, val = null) =>
+  Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));
+
initialize2DArray(2, 2, 0); // [[0,0], [0,0]]
+
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
+
pull
Mutates the original array to filter out the values specified.
Use Array.filter() and Array.includes() to pull out the values that are not needed. Use Array.length = 0 to mutate the passed in an array by resetting it's length to zero and Array.push() to re-populate it with only the pulled values.
(For a snippet that does not mutate the original array see without)
const pull = (arr, ...args) => {
+  let argState = Array.isArray(args[0]) ? args[0] : args;
+  let pulled = arr.filter((v, i) => !argState.includes(v));
+  arr.length = 0;
+  pulled.forEach(v => arr.push(v));
+};
+
let myArray = ['a', 'b', 'c', 'a', 'b', 'c'];
+pull(myArray, 'a', 'c'); // myArray = [ 'b', 'b' ]
 

Getting started

Related projects
The idea behind 30 seconds of code has inspired some people to create similar collections in other programming languages and environments. Here are the ones we like the most:

Top contributors
chalarangelo Angelos Chalaris
fejes713 Stefan Feješ
flxwu Felix Wu
atomiks atomiks
kingdavidmartins King David Martins
kriadmin Rohit Tanwar
iamsoorena Soorena Soleimani
skatcat31 Robert Mennell
How to contribute
Do you have a cool idea for a new snippet? Maybe some code you use often and is not part of our collection? Contributing to 30 seconds of code is as simple as 1,2,3,4!
1
Create
Start by creating a snippet, according to the snippet template. Make sure to follow these simple guidelines:
  • Your snippet title must be unique and the same as the name of the implemented function.
  • Use the snippet description to explain what your snippet does and how it works.
  • Try to keep the snippet's code short and to the point. Use modern techniques and features.
  • Remember to provide an example of how your snippet works.
  • Your snippet should solve a real-world problem, no matter how simple.
  • Never modify README.md or any of the HTML files.
2
Tag
Run npm run tagger from your terminal, then open the tag_database file and tag your snippet appropriately. Multitagging is also supported, just make sure the first tag you specify is on of the major tags and the one that is most relevant to the implemneted function.
3
Test
You can optionally test your snippet to make our job easier. Simply run npm run tester to generate the test files for your snippet. Find the related folder for you snippet under the test directory and write some tests. Remember to run npm run tester again to make sure your tests are passing.
4
Pull request
If you have done everything mentioned above, you should now have an awesome snippet to add to our collection. Simply start a pull request and follow the guidelines provided. Remember to only submit one snippet per pull request, so that we can quickly evaluate and merge your code into the collection.
If you need additional pointers about writing a snippet, be sure to read the complete contribution guidelines.