array.prototype.lastindexof

An ES2015 spec-compliant Array.prototype.lastindexof 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 spec.

Because Array.prototype.lastIndexOf depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.

Example

var lastIndexOf = require('array.prototype.lastindexof');
var assert = require('assert');
 
assert.equal(lastIndexOf([1, 2, 3], 2), 1);
assert.equal(lastIndexOf([1, 0, 1], 1), 2);
assert.equal(lastIndexOf([1, 2, 3], 4), -1);
assert.equal(lastIndexOf([NaN], NaN), -1);

var lastIndexOf = require('array.prototype.lastindexof');
var assert = require('assert');
/* when Array#lastIndexOf is not present */
delete Array.prototype.lastIndexOf;
var shimmed = lastIndexOf.shim();
assert.equal(shimmed, lastIndexOf.getPolyfill());
assert.equal([1, 2, 3].lastIndexOf(2), 1);
assert.equal([1, 0, 1].lastIndexOf(1), 2);
assert.equal([1, 2, 3].lastIndexOf(4), -1);
assert.equal([NaN].lastIndexOf(NaN), -1);

var lastIndexOf = require('array.prototype.lastindexof');
var assert = require('assert');
/* when Array#lastIndexOf is present */
var shimmedMap = lastIndexOf.shim();
assert.equal(shimmedMap, Array.prototype.lastIndexOf);
assert.equal([1, 2, 3].lastIndexOf(2), 1);

Tests

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

77aead9... readme

npm

array.prototype.lastindexof

array.prototype.lastindexof

Example

Tests

Keywords

Install

Weekly Downloads

Version

License

Unpacked Size

Total Files

Homepage

Repository

Last publish

Collaborators

array.prototype.lastindexof

array.prototype.lastindexof

Example

Tests

Keywords

Install

DownloadsWeekly Downloads

Version

License

Unpacked Size

Total Files

Homepage

Repository

Last publish

Collaborators

Weekly Downloads