227 lines
6.9 KiB
Markdown
227 lines
6.9 KiB
Markdown
# [copy-props][repo-url] [![NPM][npm-img]][npm-url] [![MIT License][mit-img]][mit-url] [![Build Status][travis-img]][travis-url] [![Build Status][appveyor-img]][appveyor-url] [![Coverage Status][coverage-img]][coverage-url]
|
|
|
|
Copy properties between two objects deeply.
|
|
|
|
## Install
|
|
|
|
To install from npm:
|
|
|
|
```sh
|
|
$ npm i copy-props --save
|
|
```
|
|
|
|
## Load this module
|
|
|
|
For Node.js:
|
|
|
|
```js
|
|
const copyProps = require('copy-props');
|
|
```
|
|
|
|
For Web browser:
|
|
|
|
```html
|
|
<script src="copy-props.min.js"></script>
|
|
```
|
|
|
|
## Usage
|
|
|
|
Copy *src* to *dst* simply (and return *dst*) :
|
|
|
|
```js
|
|
var src = { a: 1, b: { b1: 'bbb' }, c: 'ccc' };
|
|
var dst = { a: 2, b: { b1: 'xxx', b2: 'yyy' } };
|
|
|
|
copyProps(src, dst);
|
|
// => { a: 1, b: { b1: 'bbb', b2: 'yyy' }, c: 'ccc' }
|
|
```
|
|
|
|
Copy *src* to *dst* with property mapping (and return *dst*) :
|
|
|
|
```js
|
|
var src = { a: 1, b: { b1: 'bbb' }, c: 'ccc', d: 'ddd' };
|
|
var dst = { f: { a: 2, b1: 'xxx', b2: 'yyy' }, e: 'zzz' };
|
|
|
|
copyProps(src, dst, {
|
|
a: 'f.a',
|
|
'b.b1': 'f.b1',
|
|
'b.b2': 'f.b2',
|
|
'c': 'f.c',
|
|
});
|
|
// => { f: { a: 1, b1: 'bbb', b2: 'yyy', c: 'ccc' }, e: 'zzz' }
|
|
```
|
|
|
|
Copy *src* to *dst* with convert function (and return *dst*) :
|
|
|
|
```js
|
|
var src = { a: 1, b: { b1: 'bbb' } };
|
|
var dst = { a: 0 };
|
|
|
|
copyProps(src, dst, function(srcInfo) {
|
|
if (srcInfo.keyChain === 'a') {
|
|
return srcInfo.value * 2;
|
|
}
|
|
if (srcInfo.keyChain === 'b.b1') {
|
|
return srcInfo.value.toUpperCase();
|
|
}
|
|
});
|
|
// => { a: 2, b: { b1: 'BBB' } }
|
|
```
|
|
|
|
Can use an array instead of a map as property mapping :
|
|
|
|
```js
|
|
var src = { a: 1, b: { c: 'CCC' }, d: { e: 'EEE' } };
|
|
var dst = { a: 9, b: { c: 'xxx' }, d: { e: 'yyy' } };
|
|
var fromto = [ 'b.c', 'd.e' ];
|
|
copyProps(src, dst, fromto);
|
|
// => { a: 9, b: { c: 'CCC' }, d: { e: 'EEE' } }
|
|
```
|
|
|
|
Can copy reversively (from *dst* to *src*) by reverse flag (and return *src*):
|
|
|
|
```js
|
|
var src = { a: 1, b: { b1: 'bbb' }, c: 'ccc' };
|
|
var dst = { a: 2, b: { b1: 'xxx', b2: 'yyy' } };
|
|
|
|
copyProps(src, dst, true);
|
|
// => { a: 2, b: { b1: 'xxx', b2: 'yyy' }, c: 'ccc' }
|
|
```
|
|
|
|
```js
|
|
var src = { a: 1, b: { b1: 'bbb' }, c: 'ccc', d: 'ddd' };
|
|
var dst = { f: { a: 2, b1: 'xxx', b2: 'yyy' }, e: 'zzz' };
|
|
|
|
copyProps(src, dst, {
|
|
a: 'f.a',
|
|
'b.b2': 'f.b2',
|
|
'c': 'f.c',
|
|
}, true);
|
|
// => { a: 2, b: { b1: 'bbb', b2: 'yyy' }, c: 'ccc', d: 'ddd' }
|
|
```
|
|
|
|
If a value of source property is undefined (when not using converter), or a result of converter is undefined (when using converter), the value is not copied.
|
|
|
|
```js
|
|
var src = { a: 'A', b: undefined, c: null, d: 1 };
|
|
var dst = { a: 'a', b: 'b', c: 'c' };
|
|
|
|
copyProps(src, dst, function(srcInfo) {
|
|
if (srcInfo.keyChain === 'd') {
|
|
return undefined;
|
|
} else {
|
|
return srcInfo.value;
|
|
}
|
|
});
|
|
// => { a: 'A', b: 'b', c: null }
|
|
```
|
|
|
|
You can operate the parent node object directly in converter.
|
|
|
|
```js
|
|
var src = { a: 1, b: 2 };
|
|
var dst = {};
|
|
|
|
copyProps(src, dst, function(srcInfo, dstInfo) {
|
|
Object.defineProperty(dstInfo.parent, dstInfo.key, {
|
|
writable: false,
|
|
enumerable: true,
|
|
configurable: false,
|
|
value: srcInfo.value * 2
|
|
})
|
|
}); // => { a: 2, b: 4 }
|
|
|
|
dst // => { a: 2, b: 4 }
|
|
dst.a = 9
|
|
dst // -> { a: 2, b: 4 }
|
|
```
|
|
|
|
## API
|
|
|
|
### <u>copyProps(src, dst [, fromto] [, converter] [, reverse]) => object</u>
|
|
|
|
Copy properties of *src* to *dst* deeply.
|
|
If *fromto* is given, it is able to copy between different properties.
|
|
If *converter* is given, it is able to convert the terminal values.
|
|
|
|
#### Parameters:
|
|
|
|
| Parameter | Type | Description |
|
|
|:------------|:------:|:-------------------------------------------------|
|
|
| *src* | object | A source object of copy. |
|
|
| *dst* | object | A destinate object of copy. |
|
|
| *fromto* | object | array | An object mapping properties between *src* and *dst*. (Optional) |
|
|
| *converter* |function| A function to convert terminal values in *src*. (Optional) |
|
|
| *reverse* |boolean | True, if copying reversively from dst to src and returns src object. `fromto` is also reversively used from value to key. This default value is `false`. (Optional) |
|
|
|
|
#### Returns:
|
|
|
|
*dst* object after copying.
|
|
|
|
**Type:** object
|
|
|
|
* **Format of <i>fromto</i>**
|
|
|
|
*fromto* is a non-nested key-value object. And the *key*s are property key chains of *src* and the *value*s are property key chains of *dst*.
|
|
The key chain is a string which is concatenated property keys on each level with dots, like `'aaa.bbb.ccc'`.
|
|
|
|
The following example copys the value of `src.aaa.bbb.ccc` to `dst.xxx.yyy`.
|
|
|
|
```js
|
|
copyProps(src, dst, {
|
|
'aaa.bbb.ccc' : 'xxx.yyy'
|
|
})
|
|
```
|
|
|
|
*fromto* can be an array. In that case, the array works as a map which has pairs of same key and value.
|
|
|
|
* **API of <i>converter</i>**
|
|
|
|
**<u>converter(srcInfo, dstInfo) : Any</u>**
|
|
|
|
*converter* is a function to convert terminal values of propeerties of *src*.
|
|
|
|
**Parameters:**
|
|
|
|
| Parameter | Type | Description |
|
|
|:------------|:------:|:---------------------------------------------|
|
|
| *srcInfo* | object | An object which has informations about the current node of *src*. |
|
|
| *dstInfo* | object | An object which has informations about the current node of *dst*. |
|
|
|
|
**Return:**
|
|
|
|
The converted value to be set as a destination property value. If this value is undefined, the destination property is not set to the destination node object.
|
|
|
|
**Type:** *Any*
|
|
|
|
* **Properties of <i>srcInfo</i> and <i>dstInfo</i>**
|
|
|
|
*srcInfo* and *dstInfo* has same properties, as follows:
|
|
|
|
| Property | Type | Description |
|
|
|:-----------|:------:|:------------------------------------------|
|
|
| *value* | *Any* | The value of the current node. |
|
|
| *key* | string | The key name of the current node. |
|
|
| *keyChain* | string | The full key of the current node concatenated with dot. |
|
|
| *depth* | number | The depth of the current node. |
|
|
| *parent* | object | The parent node of the current node. |
|
|
|
|
|
|
## License
|
|
|
|
Copyright (C) 2016-2021 Gulp Team.
|
|
|
|
This program is free software under [MIT][mit-url] License.
|
|
See the file LICENSE in this distribution for more details.
|
|
|
|
[repo-url]: https://github.com/gulpjs/copy-props/
|
|
[npm-img]: https://img.shields.io/badge/npm-v2.0.5-blue.svg
|
|
[npm-url]: https://www.npmjs.org/package/copy-props/
|
|
[mit-img]: https://img.shields.io/badge/license-MIT-green.svg
|
|
[mit-url]: https://opensource.org/licenses.MIT
|
|
[travis-img]: https://travis-ci.org/gulpjs/copy-props.svg?branch=master
|
|
[travis-url]: https://travis-ci.org/gulpjs/copy-props
|
|
[appveyor-img]: https://ci.appveyor.com/api/projects/status/github/gulpjs/copy-props?branch=master&svg=true
|
|
[appveyor-url]: https://ci.appveyor.com/project/gulpjs/copy-props
|
|
[coverage-img]: https://coveralls.io/repos/github/gulpjs/copy-props/badge.svg?branch=master
|
|
[coverage-url]: https://coveralls.io/github/gulpjs/copy-props?branch=master
|