Parallel, asynchronous AJAX calls in ES6

async-parallel.js

const parallel = async (...items) => {
    const temp = [];
    for (const item of items) {
        temp.push(await item);
    }
    return temp;
};

const finalResult = await parallel(someResult(), anotherResult());
//or
//const [result1, result2] = await parallel(someResult(), anotherResult());


// Alternative Implementation:
async function stepVerifyIdentity(nextState, replace, callback) {
  const [ val1, val2, val3 ] = await Promise.all([
    promise1('Param1'),
    promise2('Param2'),
    promise3('Param3')
  ])

  if (!val1 && (!val2 || !val3)) {
    console.log('Do something')
  } 
}

Sourced from:
https://stackoverflow.com/questions/35612428/call-async-await-functions-in-parallel
https://stackoverflow.com/questions/39371954/awaiting-several-promises-in-one-async-function
https://stackoverflow.com/questions/24193595/slowdown-due-to-non-parallel-awaiting-of-promises-in-async-generators