array.prototype.indexof (original) (raw)

1.0.8 • Public • Published 5 months ago

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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