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

Usage no npm install needed!

<script type="module">
  import favPropPick from 'https://cdn.skypack.dev/@fav/prop.pick';


@fav/prop.pick NPM MIT License Build Status Build Status Coverage status

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.


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.


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


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.


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


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


Node.js (4〜)

Platform 4 5 6 7 8 9 10

io.js (1〜3)

Platform 1 2 3

Node.js (〜0.12)

Platform 0.7 0.8 0.9 0.10 0.11 0.12

Web browsers

Platform Chrome Firefox Vivaldi Safari Edge IE11
macOS -- --
Windows10 --
Linux -- -- --


Copyright (C) 2017-2018 Takayuki Sato

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