array.prototype.findlast
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Package description
The array.prototype.findlast npm package extends the Array prototype to include a `findLast` method. This method allows users to search through an array from the end towards the beginning, returning the last element that satisfies a provided testing function. It is particularly useful for finding the last occurrence of elements in an array that meet certain criteria.
Finding the last element that meets a condition
This feature allows you to find the last element in an array that meets a specific condition. In the provided code sample, `findLast` is used to find the last even number in the array.
[1, 2, 3, 4, 5].findLast(element => element % 2 === 0)Lodash is a popular utility library that includes a `findLast` method. This method is similar to array.prototype.findlast in that it searches an array from the end and returns the last element that passes a given test. The main difference is that lodash's `findLast` is a standalone function that takes the array as an argument, rather than being a method on the array prototype.
Underscore.js is another utility library that offers similar functionality through its `findLast` method. Like lodash, it provides this functionality as a part of a larger set of utilities for working with arrays, objects, and functions. The approach to finding the last element that meets a condition is similar, but underscore does not modify the array prototype.
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Readme
An ESnext spec-compliant Array.prototype.findLast shim/polyfill/replacement that works as far down as ES3.
This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the proposed spec.
Because Array.prototype.findLast depends on a receiver (the this value), the main export takes the array to operate on as the first argument.
npm install --save array.prototype.findlast
var findLast = require('array.prototype.findlast');
var assert = require('assert');
var arr = [1, [2], [], 3, [[4]]];
var isNumber = function (x) { return typeof x === 'number' };
assert.deepEqual(findLast(arr, isNumber), 3);
var findLast = require('array.prototype.findlast');
var assert = require('assert');
/* when Array#findLast is not present */
delete Array.prototype.findLast;
var shimmed = findLast.shim();
assert.equal(shimmed, findLast.getPolyfill());
assert.deepEqual(arr.findLast(isNumber), findLast(arr, isNumber));
var findLast = require('array.prototype.findlast');
var assert = require('assert');
/* when Array#findLast is present */
var shimmed = findLast.shim();
assert.equal(shimmed, Array.prototype.findLast);
assert.deepEqual(arr.findLast(isNumber), findLast(arr, isNumber));
Simply clone the repo, npm install, and run npm test
FAQs
An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.
We found that array.prototype.findlast demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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