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# p-locate [![Build Status](https://travis-ci.com/sindresorhus/p-locate.svg?branch=master)](https://travis-ci.com/github/sindresorhus/p-locate)
> Get the first fulfilled promise that satisfies the provided testing function
Think of it like an async version of [`Array#find`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/find).
## Install
```
$ npm install p-locate
```
## Usage
Here we find the first file that exists on disk, in array order.
```js
const pathExists = require('path-exists');
const pLocate = require('p-locate');
const files = [
'unicorn.png',
'rainbow.png', // Only this one actually exists on disk
'pony.png'
];
(async () => {
const foundPath = await pLocate(files, file => pathExists(file));
console.log(foundPath);
//=> 'rainbow'
})();
```
*The above is just an example. Use [`locate-path`](https://github.com/sindresorhus/locate-path) if you need this.*
## API
### pLocate(input, tester, options?)
Returns a `Promise` that is fulfilled when `tester` resolves to `true` or the iterable is done, or rejects if any of the promises reject. The fulfilled value is the current iterable value or `undefined` if `tester` never resolved to `true`.
#### input
Type: `Iterable<Promise | unknown>`
An iterable of promises/values to test.
#### tester(element)
Type: `Function`
This function will receive resolved values from `input` and is expected to return a `Promise<boolean>` or `boolean`.
#### options
Type: `object`
##### concurrency
Type: `number`\
Default: `Infinity`\
Minimum: `1`
Number of concurrently pending promises returned by `tester`.
##### preserveOrder
Type: `boolean`\
Default: `true`
Preserve `input` order when searching.
Disable this to improve performance if you don't care about the order.
## Related
- [p-map](https://github.com/sindresorhus/p-map) - Map over promises concurrently
- [p-filter](https://github.com/sindresorhus/p-filter) - Filter promises concurrently
- [p-any](https://github.com/sindresorhus/p-any) - Wait for any promise to be fulfilled
- [More…](https://github.com/sindresorhus/promise-fun)
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