patmigliaccio.com/async-fishing 12/11/16

async-fishing-all.js

function all(promises){
	let len = promises.length,
		returned = 0,
		responses = [];

	let totalPromise = new Promise((resolve, reject) => {
		promises.forEach((p, i) => {	
			p.then(response => {
					responses[i] = response;
				})
				.catch(error => {
					responses[i] = new Error(error);
				})
				.then(() => {
					returned++;
					
					if (len == returned){
						resolve(responses)
					}
				});
		});
	});
		
	return totalPromise;
}