Gecko [ fernandoquevedodop.com ]

Name	Size	Permission
index.d.ts	1.43 KB	-rw-r--r--
index.js	1.13 KB	-rw-r--r--
package.json	942 B	-rw-r--r--

Code Editor : index.js

'use strict';
const pLimit = require('p-limit');

class EndError extends Error {
	constructor(value) {
		super();
		this.value = value;
	}
}

// The input can also be a promise, so we await it
const testElement = async (element, tester) => tester(await element);

// The input can also be a promise, so we `Promise.all()` them both
const finder = async element => {
	const values = await Promise.all(element);
	if (values[1] === true) {
		throw new EndError(values[0]);
	}

return false;
};

const pLocate = async (iterable, tester, options) => {
	options = {
		concurrency: Infinity,
		preserveOrder: true,
		...options
	};

const limit = pLimit(options.concurrency);

// Start all the promises concurrently with optional limit
	const items = [...iterable].map(element => [element, limit(testElement, element, tester)]);

// Check the promises either serially or concurrently
	const checkLimit = pLimit(options.preserveOrder ? 1 : Infinity);

try {
		await Promise.all(items.map(element => checkLimit(finder, element)));
	} catch (error) {
		if (error instanceof EndError) {
			return error.value;
		}

throw error;
	}
};

module.exports = pLocate;

${this.title}

Code Editor : index.js