array.prototype.indexof

array.prototype.indexof

An ES2015 spec-compliant Array.prototype.indexof 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.indexOf depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.

Example

var indexOf = require('array.prototype.indexof');
var assert = require('assert');

assert.equal(indexOf([1, 2, 3], 2), 1);
assert.equal(indexOf([1, 0, 1], 1), 0);
assert.equal(indexOf([1, 2, 3], 4), -1);
assert.equal(indexOf([NaN], NaN), -1);

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

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

Tests

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

Changelog

v1.0.8 - 2024-12-20

Commits

• [actions] split out node 10-20, and 20+ a8ce49d
• [Dev Deps] update @es-shims/api, @ljharb/eslint-config, auto-changelog, tape 3d90e3a
• [Refactor] use call-bound directly f5aa29e
• [Deps] update call-bind, es-abstract, is-string eb46fe3
• [Tests] replace aud with npm audit 2adc98e
• [Dev Deps] add missing peer dep a714cf8