@fav/prop.defaults

Copys enumerable own properties of source objects to destination object for destination properties which are undefined or null.

"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.defaults

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.defaults/ directory manually.

Usage

For Node.js:

var defaults = require('@fav/prop.defaults');
defaults({ a: 1, b: 2 }, { a: 10, c: 30 });
// => { a: 1, b: 2, c: 30 }

For Web browsers:

<script src="fav.prop.defaults.min.js"></script>
<script>
var defaults = fav.prop.defaults;
defaults({ a: 1, b: 2 }, { a: 10, c: 30 });
// => { a: 1, b: 2, c: 30 }
</script>

API

defaults(dest [, ...src]) : object

Copys enumerable own properties (both keys and symbols) of source objects to a destination object when each property value is null or undefined. If a property value of a source object is null or undefined, the property is not copied.

NOTE: This function does not throw an error when copying a source property to a destination property which is read only.

Parameters:

| Parameter | Type | Description | |-----------|:--------:|---------------------------| | dest | object | The destination object. | | src | object | The source object(s). |

Returns:

The destination object.

Type: 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 | 0.8 | 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.