数组. prototype.findlastindex

一个符合ESnext的光谱 Array.prototype.findLastIndex shim/polyfill/取而代之,其效可达ES3.

此软件包执行 希姆・API 接口。 它在ES3支持的环境中工作,并遵守拟议 光谱。 。 。 .

因为 Array.prototype.findLastIndex 取决于接收器( this 值,主要导出以数组作为第一个参数.

开始

npm install --save array.prototype.findlastindex

使用/实例

var findLastIndex = require('array.prototype.findlastindex');
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('array.prototype.findlastindex');
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('array.prototype.findlastindex');
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));

测试

仅仅复制回转, npm install运行 npm test