Alternative to Promise.all which will be resolved even when one or more promises are rejected.

promise-wait-for.js

function promiseOK() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve();
    }, 100);
  });
}

function promiseFail() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      reject();
    }, 200);
  });
}

function WaitFor(promises) {
  return new Promise((resolve, reject) => {
    let remaining = promises.length;
    
    promises.forEach(promise => {
      promise
        .then(() => {
          decrement();
        })
        .catch(() => {
          decrement();
        });
    });

    function decrement() {
      remaining--;
      if (remaining === 0) {
        resolve();
      }
    }
  });
}

WaitFor([
  promiseOK(), 
  promiseFail().catch(() => { console.log('catch can still be caught')}),
  promiseOK(),
  promiseOK()])
  .then(() => {
    console.log('ALL IS DONE');
  })