promiseArray.js

var PromiseArray = [];

el.addEventListener('scroll', function(e) {
  PromiseArray.push(new Promise(...));
  forEachForPromise();
});

function forEachForPromises() {
  PromiseArray.filter(function(promise) {
    promise.then(function(data) {
      if (...) {}
    });
    
    return ???;
  }); 
}