p-locate
Get the first fulfilled promise that satisfies the provided testing function
Think of it like an async version of Array#find.
Install
npm install p-locate
Usage
Here we find the first file that exists on disk, in array order.
import {pathExists} from 'path-exists';
import pLocate from 'p-locate';
const files = [
'unicorn.png',
'rainbow.png', // Only this one actually exists on disk
'pony.png'
];
const foundPath = await pLocate(files, file => pathExists(file));
console.log(foundPath);
//=> 'rainbow.png'
The above is just an example. Use 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> | AsyncIterable<unknown>
An iterable or async iterable of promises/values to test.
When an AsyncIterable is given, it is iterated serially and the concurrency and preserveOrder options are not applicable.
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
The 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.