All Downloads are FREE. Search and download functionalities are using the official Maven repository.

node_modules.p-locate.readme.md Maven / Gradle / Ivy

The newest version!
# p-locate [![Build Status](https://travis-ci.org/sindresorhus/p-locate.svg?branch=master)](https://travis-ci.org/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 --save 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'
];

pLocate(files, file => pathExists(file)).then(foundPath => {
	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`

#### tester(element)

Type: `Function`

Expected to return a `Promise` 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) ## License MIT © [Sindre Sorhus](https://sindresorhus.com)




© 2015 - 2024 Weber Informatics LLC | Privacy Policy