@fav/prop.enum-own-keys

Lists enumerable own property keys of an object.

"fav" is an abbreviation of "favorite" and also the acronym of "for all versions". This package is intended to support all Node.js versions and many browsers as possible. At least, this package supports Node.js >= v0.10 and major Web browsers: Chrome, Firefox, IE11, Edge, Vivaldi and Safari.

Install

To install from npm:

$ npm install --save @fav/prop.enum-own-keys

NOTE: npm < 2.7.0 does not support scoped package, but old version Node.js supports it. So when you use such older npm, you should download this package from github.com, and move it in node_modules/@fav/prop.enum-own-keys/ directory manually.

Usage

For Node.js:

var enumOwnKeys = require('@fav/prop.enum-own-keys');
enumOwnKeys({ a: 1, b: true, c: 'C' }); // => ['a', 'b', 'c']

function Fn() { this.a = 1; }
Fn.prototype.b = true;
var fn = new Fn();
Object.defineProperty(fn, 'c', { value: 'C' });
enumOwnKeys(fn); // => ['a']

For Web browsers:

<script src="fav.prop.enum-own-keys.min.js"></script>
<script>
var enumOwnKeys = fav.prop.enumOwnKeys;
enumOwnKeys({ a: 1, b: true, c: 'C' }); // => ['a', 'b', 'c']
</script>

API

enumOwnKeys(obj) : Array

Lists own enumerable property keys of a given object.

This function returns the same result of Object.keys(obj), but returns an empty array if obj is nullish.

NOTE: The behavior of Object.keys is different between before and after of Node.js v0.12 when the argument is not an object.

Parameter:

| Parameter | Type | Description | |-----------|:------:|--------------------------------------------| | obj | object | The object to be listed its property keys. |

Return:

An array of property keys.

Type: Array

Checked

Node.js (4〜)

| Platform | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |:---------:|:------:|:------:|:------:|:------:|:------:|:------:|:------:| | macOS |◯|◯|◯|◯|◯|◯|◯| | Windows10 |◯|◯|◯|◯|◯|◯|◯| | Linux |◯|◯|◯|◯|◯|◯|◯|

io.js (1〜3)

| Platform | 1 | 2 | 3 | |:---------:|:------:|:------:|:------:| | macOS |◯|◯|◯| | Windows10 |◯|◯|◯| | Linux |◯|◯|◯|

Node.js (〜0.12)

| Platform | 0.8 | 0.9 | 0.10 | 0.11 | 0.12 | |:---------:|:------:|:------:|:------:|:------:|:------:| | macOS |◯|◯|◯|◯|◯| | Windows10 |◯|◯|◯|◯|◯| | Linux |◯|◯|◯|◯|◯|

Web browsers

| Platform | Chrome | Firefox | Vivaldi | Safari | Edge | IE11 | |:---------:|:------:|:-------:|:-------:|:------:|:------:|:------:| | macOS |◯|◯ |◯ |◯| -- | -- | | Windows10 |◯|◯ |◯ | -- |◯|◯| | Linux |◯|◯ |◯ | -- | -- | -- |

License

Copyright (C) 2017-2018 Takayuki Sato

This program is free software under MIT License. See the file LICENSE in this distribution for more details.