array.prototype.keys

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

Changelog

v1.1.3 - 2024-03-19

Commits

• [meta] remove useless ESM 8c934c4
• [actions] remove redundant finisher c1707be
• [Refactor] use es-object-atoms and is-callable instead of es-abstract f31da3d
• [Deps] update call-bind, define-properties, es-abstract, es-create-array-iterator, es-shim-unscopables 7613579
• [Dev Deps] update aud, function-bind, npmignore, tape 18300be
• [Deps] update call-bind, es-create-array-iterator 0dc2391
• [Dev Deps] update tape 61f2501