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    array.prototype.keys

    1.1.0 • Public • Published

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    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

    Install

    npm i array.prototype.keys

    DownloadsWeekly Downloads

    45

    Version

    1.1.0

    License

    MIT

    Unpacked Size

    22.1 kB

    Total Files

    17

    Last publish

    Collaborators

    • ljharb