magnam-doloribus-minima
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MIT License
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@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
npm install --save @hoangcung1804npm/magnam-doloribus-minima
Usage/Examples
var findLastIndex = require('@hoangcung1804npm/magnam-doloribus-minima');
var assert = require('assert');
var arr = [1, [2], [], 3, [[4]]];
var isNumber = function (x) { return typeof x === 'number' };
assert.deepEqual(findLastIndex(arr, isNumber), 3);
var findLastIndex = require('@hoangcung1804npm/magnam-doloribus-minima');
var assert = require('assert');
/* when Array#findLastIndex is not present */
delete Array.prototype.findLastIndex;
var shimmed = findLastIndex.shim();
assert.equal(shimmed, findLastIndex.getPolyfill());
assert.deepEqual(arr.findLastIndex(isNumber), findLastIndex(arr, isNumber));
var findLastIndex = require('@hoangcung1804npm/magnam-doloribus-minima');
var assert = require('assert');
/* when Array#findLastIndex is present */
var shimmed = findLastIndex.shim();
assert.equal(shimmed, Array.prototype.findLastIndex);
assert.deepEqual(arr.findLastIndex(isNumber), findLastIndex(arr, isNumber));
Tests
Simply clone the repo, npm install, and run npm test
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