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An ES2015 spec-compliant `Array.prototype.lastIndexOf` shim/polyfill/replacement that works as far down as ES3.

License: MIT License

JavaScript 100.00%

javascript ecmascript shim polyfill array lastindexof

array.prototype.lastindexof's Introduction

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

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array.prototype.lastindexof's Issues

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.github/workflows/node-aught.yml

.github/workflows/node-pretest.yml

.github/workflows/node-tens.yml

.github/workflows/rebase.yml

.github/workflows/require-allow-edits.yml

npm

package.json

call-bind ^1.0.7

define-properties ^1.2.1

es-abstract ^1.23.2

es-object-atoms ^1.0.0

is-negative-zero ^2.0.3

is-string ^1.0.7

@es-shims/api ^2.4.2

@ljharb/eslint-config ^21.1.0

aud ^2.0.4

auto-changelog ^2.4.0

eslint =8.8.0

evalmd ^0.0.19

functions-have-names ^1.2.3

has-strict-mode ^1.0.1

in-publish ^2.0.1

npmignore ^0.3.1

nyc ^10.3.2

safe-publish-latest ^2.0.0

tape ^5.7.5

node >= 0.4

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An in-range update of auto-changelog is breaking the build 🚨

☝️ Important announcement: Greenkeeper will be saying goodbye 👋 and passing the torch to Snyk on June 3rd, 2020! Find out how to migrate to Snyk and more at greenkeeper.io

The devDependency auto-changelog was updated from `1.16.2` to `1.16.3`.

🚨 View failing branch.

This version is covered by your current version range and after updating it in your project the build failed.

auto-changelog is a devDependency of this project. It might not break your production code or affect downstream projects, but probably breaks your build or test tools, which may prevent deploying or publishing.

Status Details

❌ Travis CI - Branch: The build failed.

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The new version differs by 4 commits.

b2f3c98 1.16.3
1ced7a8 Bump packages
107445f Add FUNDING.yml
a8da4cd Bump handlebars from 4.1.2 to 4.3.0 (#147)

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An in-range update of es-abstract is breaking the build 🚨