mirror of https://github.com/jkjoy/sunpeiwen.git
131 lines
5.2 KiB
Markdown
131 lines
5.2 KiB
Markdown
# unset-value [](https://www.npmjs.com/package/unset-value) [](https://npmjs.org/package/unset-value) [](https://npmjs.org/package/unset-value) [](https://travis-ci.org/jonschlinkert/unset-value)
|
|
|
|
> Delete nested properties from an object using dot notation.
|
|
|
|
## Install
|
|
|
|
Install with [npm](https://www.npmjs.com/):
|
|
|
|
```sh
|
|
$ npm install --save unset-value
|
|
```
|
|
|
|
## Usage
|
|
|
|
```js
|
|
var unset = require('unset-value');
|
|
|
|
var obj = {a: {b: {c: 'd', e: 'f'}}};
|
|
unset(obj, 'a.b.c');
|
|
console.log(obj);
|
|
//=> {a: {b: {e: 'f'}}};
|
|
```
|
|
|
|
## Examples
|
|
|
|
### Updates the object when a property is deleted
|
|
|
|
```js
|
|
var obj = {a: 'b'};
|
|
unset(obj, 'a');
|
|
console.log(obj);
|
|
//=> {}
|
|
```
|
|
|
|
### Returns true when a property is deleted
|
|
|
|
```js
|
|
unset({a: 'b'}, 'a') // true
|
|
```
|
|
|
|
### Returns `true` when a property does not exist
|
|
|
|
This is consistent with `delete` behavior in that it does not
|
|
throw when a property does not exist.
|
|
|
|
```js
|
|
unset({a: {b: {c: 'd'}}}, 'd') // true
|
|
```
|
|
|
|
### delete nested values
|
|
|
|
```js
|
|
var one = {a: {b: {c: 'd'}}};
|
|
unset(one, 'a.b');
|
|
console.log(one);
|
|
//=> {a: {}}
|
|
|
|
var two = {a: {b: {c: 'd'}}};
|
|
unset(two, 'a.b.c');
|
|
console.log(two);
|
|
//=> {a: {b: {}}}
|
|
|
|
var three = {a: {b: {c: 'd', e: 'f'}}};
|
|
unset(three, 'a.b.c');
|
|
console.log(three);
|
|
//=> {a: {b: {e: 'f'}}}
|
|
```
|
|
|
|
### throws on invalid args
|
|
|
|
```js
|
|
unset();
|
|
// 'expected an object.'
|
|
```
|
|
|
|
## About
|
|
|
|
### Related projects
|
|
|
|
* [get-value](https://www.npmjs.com/package/get-value): Use property paths (`a.b.c`) to get a nested value from an object. | [homepage](https://github.com/jonschlinkert/get-value "Use property paths (`a.b.c`) to get a nested value from an object.")
|
|
* [get-values](https://www.npmjs.com/package/get-values): Return an array of all values from the given object. | [homepage](https://github.com/jonschlinkert/get-values "Return an array of all values from the given object.")
|
|
* [omit-value](https://www.npmjs.com/package/omit-value): Omit properties from an object or deeply nested property of an object using object path… [more](https://github.com/jonschlinkert/omit-value) | [homepage](https://github.com/jonschlinkert/omit-value "Omit properties from an object or deeply nested property of an object using object path notation.")
|
|
* [put-value](https://www.npmjs.com/package/put-value): Update only existing values from an object, works with dot notation paths like `a.b.c` and… [more](https://github.com/tunnckocore/put-value#readme) | [homepage](https://github.com/tunnckocore/put-value#readme "Update only existing values from an object, works with dot notation paths like `a.b.c` and support deep nesting.")
|
|
* [set-value](https://www.npmjs.com/package/set-value): Create nested values and any intermediaries using dot notation (`'a.b.c'`) paths. | [homepage](https://github.com/jonschlinkert/set-value "Create nested values and any intermediaries using dot notation (`'a.b.c'`) paths.")
|
|
* [union-value](https://www.npmjs.com/package/union-value): Set an array of unique values as the property of an object. Supports setting deeply… [more](https://github.com/jonschlinkert/union-value) | [homepage](https://github.com/jonschlinkert/union-value "Set an array of unique values as the property of an object. Supports setting deeply nested properties using using object-paths/dot notation.")
|
|
* [upsert-value](https://www.npmjs.com/package/upsert-value): Update or set nested values and any intermediaries with dot notation (`'a.b.c'`) paths. | [homepage](https://github.com/doowb/upsert-value "Update or set nested values and any intermediaries with dot notation (`'a.b.c'`) paths.")
|
|
|
|
### Contributing
|
|
|
|
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
|
|
|
|
### Contributors
|
|
|
|
| **Commits** | **Contributor** |
|
|
| --- | --- |
|
|
| 6 | [jonschlinkert](https://github.com/jonschlinkert) |
|
|
| 2 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |
|
|
|
|
### Building docs
|
|
|
|
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
|
|
|
|
To generate the readme, run the following command:
|
|
|
|
```sh
|
|
$ npm install -g verbose/verb#dev verb-generate-readme && verb
|
|
```
|
|
|
|
### Running tests
|
|
|
|
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
|
|
|
|
```sh
|
|
$ npm install && npm test
|
|
```
|
|
|
|
### Author
|
|
|
|
**Jon Schlinkert**
|
|
|
|
* [github/jonschlinkert](https://github.com/jonschlinkert)
|
|
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
|
|
|
|
### License
|
|
|
|
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
|
|
Released under the [MIT License](LICENSE).
|
|
|
|
***
|
|
|
|
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.4.2, on February 25, 2017._ |