array.prototype.keys (original) (raw)

1.1.3 • Public • Published a year ago

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array.prototype.keys

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

Example

var keys = require('array.prototype.keys'); var assert = require('assert'); var iterate = require('iterate-iterator');

assert.deepEqual(iterate(keys([1, 2, 3])), [0, 1, 2]); assert.deepEqual(iterate(keys([1, 0, 1])), [0, 1, 2]); assert.deepEqual(iterate(keys([NaN])), [0]); assert.deepEqual(iterate(keys([1,,3])), [0, 1, 2]);

var keys = require('array.prototype.keys'); var assert = require('assert'); /* when Array#keys is not present */ delete Array.prototype.keys; var shimmedMap = keys.shim(); assert.deepEqual(shimmedMap, keys.getPolyfill()); assert.deepEqual(iterate([1, 2, 3].keys()), [0, 1, 2]); assert.deepEqual(iterate([1, 0, 1].keys()), [0, 1, 2]); assert.deepEqual(iterate([NaN].keys()), [0]); assert.deepEqual(iterate([1,,3].keys()), [0, 1, 2]);

var keys = require('array.prototype.keys'); var assert = require('assert'); /* when Array#keys is present */ var shimmedMap = keys.shim(); assert.equal(shimmedMap, Array.prototype.keys); assert.deepEqual(iterate([1, 2, 3].keys()), [0, 1, 2]);

Tests

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