@hoangcung1804npm/magnam-doloribus-minima

An ESnext spec-compliant Array.prototype.findLastIndex 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.findLastIndex depends on a receiver (the this value), the main export takes the array to operate on as the first argument.

Getting started

1npm install --save @hoangcung1804npm/magnam-doloribus-minima

Usage/Examples

1var findLastIndex = require('@hoangcung1804npm/magnam-doloribus-minima');
2var assert = require('assert');
3
4var arr = [1, [2], [], 3, [[4]]];
5var isNumber = function (x) { return typeof x === 'number' };
6
7assert.deepEqual(findLastIndex(arr, isNumber), 3);

1var findLastIndex = require('@hoangcung1804npm/magnam-doloribus-minima');
2var assert = require('assert');
3/* when Array#findLastIndex is not present */
4delete Array.prototype.findLastIndex;
5var shimmed = findLastIndex.shim();
6
7assert.equal(shimmed, findLastIndex.getPolyfill());
8assert.deepEqual(arr.findLastIndex(isNumber), findLastIndex(arr, isNumber));

1var findLastIndex = require('@hoangcung1804npm/magnam-doloribus-minima');
2var assert = require('assert');
3/* when Array#findLastIndex is present */
4var shimmed = findLastIndex.shim();
5
6assert.equal(shimmed, Array.prototype.findLastIndex);
7assert.deepEqual(arr.findLastIndex(isNumber), findLastIndex(arr, isNumber));

Tests

Simply clone the repo, npm install, and run npm test