P-one NPM | npm.io

p-one

Test whether some promise passes a testing function

Like Array.some for promises.

Install

$ npm install --save p-one

Usage

const pOne = require('p-one');
const getContinent = require('get-continent'); // not a real module

const places = [
	getCapital('Norway').then(info => info.name),
	'Bangkok, Thailand',
	'Berlin, Germany',
	'Tokyo, Japan'
];

const testFunction = async place => {
	const continent = await getContinent(place);
	return continent === 'europe';
}

(async () => {
	const result = await pOne(places, testFunction)
	console.log(result);
	//=> true
})();

API

pOne(input, testFunction, options)

Returns a Promise that is fulfilled when any promise in input and ones returned from testFunction are fulfilled, or rejects if any of the promises reject. The fulfilled value is a boolean that is true if any promise passed the test and false otherwise.

input

Type: Iterable<Promise|any>

Iterated over concurrently in the testFunction function.

testFunction(element, index)

Type: Function

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 testFunction.

p-every - Test whether all promises passes a testing function
p-filter - Filter promises concurrently
p-locate - Get the first fulfilled promise that satisfies the provided testing function
p-map - Map over promises concurrently
More…