@fav/prop.pick

Creates a new plain object and copys properties of a source object only specified.

"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.pick

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.pick/ directory manually.

Usage

For Node.js:

var pick = require('@fav/prop.pick');
pick({ a: 1, b: 2, c: 3 }, ['b']); // => { b: 2 }

For Web browsers:

<script src="fav.prop.pick.min.js"></script>
<script>
var pick = fav.prop.pick;
pick({ a: 1, b: 2, c: 3 }, ['b']); // => { b: 2 }
</script>

API

pick(src, pickedProps) : object

Creates a new plain object and copies enumerable own properties (keys and symbols) of src object, and the copied properties are only included in pickedProps.

NOTE: All versions of Node.js allows to use a string array for getting or setting property, like obj[['a','b']] == obj['a,b']. An Symbol array is allowed as same until v4, but is not allowed on v5 and later (TypeError is thrown). To support same behaviors for all versions, this function does not allow to use an array as a property.

Parameters:

Parameter	Type	Description
src	object	A source object.
pickedProps	Array	A property keys and symbols to be copied.

Returns:

A plain object which is copied property keys and symbols of a source object.

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	0.7	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.