Promise based parallel task executor

gistfile1.js

"use strict";

function parallel(tasks, ...args) {

    let error;
    let results = [];

    for (let curTask of tasks) {
        try {
            results.push(curTask(...args));
        }
        catch(e) {
            error = e;
            break;
        }
    }
    
    if (error) {
        return Promise.reject(error);
    }
    
    return Promise.all(results);
}