diff --git a/README.md b/README.md index 8a094e10a..536ff0ff6 100644 --- a/README.md +++ b/README.md @@ -99,6 +99,7 @@ average(1, 2, 3); * [`dropRight`](#dropright) * [`everyNth`](#everynth) * [`filterNonUnique`](#filternonunique) +* [`findLast`](#findlast) * [`flatten`](#flatten) * [`forEachRight`](#foreachright) * [`groupBy`](#groupby) @@ -799,6 +800,28 @@ filterNonUnique([1, 2, 2, 3, 4, 4, 5]); // [1,3,5]
[⬆ Back to top](#table-of-contents) +### findLast + +Returns the last element for which the provided function returns a truthy value. + +Use `Array.filter()` to remove elements for which `fn` returns falsey values, `Array.slice(-1)` to get the last one. + +```js +const findLast = (arr, fn) => arr.filter(fn).slice(-1); +``` + +
+Examples + +```js +findLast([1, 2, 3, 4], n => n % 2 === 1); // 3 +``` + +
+ +
[⬆ Back to top](#table-of-contents) + + ### flatten Flattens an array up to the specified depth. @@ -5339,6 +5362,7 @@ const httpPost = (url, callback, data = null, err = console.error) => { + const newPost = { "userId": 1, "id": 1337, diff --git a/docs/index.html b/docs/index.html index ed5cc6720..bb144c84a 100644 --- a/docs/index.html +++ b/docs/index.html @@ -50,7 +50,7 @@ scrollToTop(); } }, false); - }

logo 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);
+      }
logo 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 ]
@@ -126,6 +126,8 @@ Object.assig
 
everyNth([1, 2, 3, 4, 5, 6], 2); // [ 2, 4, 6 ]
 
filterNonUnique
Filters out the non-unique values in an array.
Use Array.filter() for an array containing only the unique values.
const filterNonUnique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i));
 
filterNonUnique([1, 2, 2, 3, 4, 4, 5]); // [1,3,5]
+
findLast
Returns the last element for which the provided function returns a truthy value.
Use Array.filter() to remove elements for which fn returns falsey values, Array.slice(-1) to get the last one.
const findLast = (arr, fn) => arr.filter(fn).slice(-1);
+
findLast([1, 2, 3, 4], n => n % 2 === 1); // 3
 
flatten
Flattens an array up to the specified depth.
Use recursion, decrementing depth by 1 for each level of depth. Use Array.reduce() and Array.concat() to merge elements or arrays. Base case, for depth equal to 1 stops recursion. Omit the second argument, depth to flatten only to a depth of 1 (single flatten).
const flatten = (arr, depth = 1) =>
   depth != 1
     ? arr.reduce((a, v) => a.concat(Array.isArray(v) ? flatten(v, depth - 1) : v), [])
@@ -1194,6 +1196,7 @@ Logs: {
 
 
 
+
 const newPost = {
   "userId": 1,
   "id": 1337,
diff --git a/snippets/findLast.md b/snippets/findLast.md
index 9dfa824d3..901920049 100644
--- a/snippets/findLast.md
+++ b/snippets/findLast.md
@@ -9,5 +9,5 @@ const findLast = (arr, fn) => arr.filter(fn).slice(-1);
 ```
 
 ```js
-findLast([1, 2, 3, 4], n => n % 2 === 1) // 3
+findLast([1, 2, 3, 4], n => n % 2 === 1); // 3
 ```
diff --git a/snippets/httpPost.md b/snippets/httpPost.md
index 4976ff767..15246d648 100644
--- a/snippets/httpPost.md
+++ b/snippets/httpPost.md
@@ -32,6 +32,7 @@ const httpPost = (url, callback, data = null, err = console.error) => {
 
 
 
+
 const newPost = {
   "userId": 1,
   "id": 1337,