@fav/prop.pick-deep

Creates a new plain object and copies child and descendant properties of a source object only specified deeply.

"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-deep

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-deep/ directory manually.

Usage

For Node.js:

var pickDeep = require('@fav/prop.pick-deep');
pickDeep({ a: 1, b: { c: 3, d: 4 }, e: 5 }, [['b', 'c'], 'e']); // => { b: { c: 3 }, e: 5 }

For Web browsers:

<script src="fav.prop.pick-deep.min.js"></script>
<script>
var pickDeep = fav.prop.pickDeep;
pickDeep({ a: 1, b: { c: 3, d: 4 }, e: 5 }, [['b', 'c'], 'e']); // => { b: { c: 3 }, e: 5 }
</script>

API

pickDeep(src, pickedPropPaths) : object

Creates a new plain object and copies child and descendant enumerable own properties (keys and symbols) of src object deeply, and the properties which are included in pickedPropPaths are picked.

pickedPropPaths is an array of property paths. A property path is an array of keys/symbols which are passed from root to a target property in property tree of src object. For example, the property path of c in { a : { b: { c: 1 } } } => ['a', 'b', 'c']. For a top property, a string or a symbol can be specified.

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. (Thus, a property path needs to be always one dimensional array).

Parameters:

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

Returns:

A plain object which is copied property paths keys.

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.