forked from zhurui/management
53 lines
892 B
Markdown
53 lines
892 B
Markdown
|
# onetime [](https://travis-ci.org/sindresorhus/onetime)
|
||
|
|
|
||
|
|
> Only call a function once
|
||
|
|
|
||
|
|
When called multiple times it will return the return value from the first call.
|
||
|
|
|
||
|
|
*Unlike the module [once](https://github.com/isaacs/once), this one isn't naughty extending `Function.prototype`.*
|
||
|
|
|
||
|
|
|
||
|
|
## Install
|
||
|
|
|
||
|
|
```
|
||
|
|
$ npm install --save onetime
|
||
|
|
```
|
||
|
|
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
```js
|
||
|
|
let i = 0;
|
||
|
|
|
||
|
|
const foo = onetime(() => i++);
|
||
|
|
|
||
|
|
foo(); //=> 0
|
||
|
|
foo(); //=> 0
|
||
|
|
foo(); //=> 0
|
||
|
|
```
|
||
|
|
|
||
|
|
|
||
|
|
## API
|
||
|
|
|
||
|
|
### onetime(function, [shouldThrow])
|
||
|
|
|
||
|
|
#### function
|
||
|
|
|
||
|
|
Type: `function`
|
||
|
|
|
||
|
|
Function that should only be called once.
|
||
|
|
|
||
|
|
#### shouldThrow
|
||
|
|
|
||
|
|
Type: `boolean`
|
||
|
|
Default: `false`
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
Set to `true` if you want it to fail with a nice and descriptive error when called more than once.
|
||
|
|
|
||
|
|
|
||
|
|
## License
|
||
|
|
|
||
|
|
MIT © [Sindre Sorhus](http://sindresorhus.com)
|