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# split-on-first [](https://travis-ci.com/sindresorhus/split-on-first)
> Split a string on the first occurrence of a given separator
This is similar to [`String#split()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split), but that one splits on all the occurrences, not just the first one.
## Install
```
$ npm install split-on-first
```
## Usage
```js
const splitOnFirst = require('split-on-first');
splitOnFirst('a-b-c', '-');
//=> ['a', 'b-c']
splitOnFirst('key:value:value2', ':');
//=> ['key', 'value:value2']
splitOnFirst('a---b---c', '---');
//=> ['a', 'b---c']
splitOnFirst('a-b-c', '+');
//=> ['a-b-c']
```
## API
### splitOnFirst(string, separator)
#### string
Type: `string`
The string to split.
#### separator
Type: `string`
The separator to split on.
## Related
- [split-at](https://github.com/sindresorhus/split-at) - Split a string at one or more indices
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)