SOURCE

var a = [1,2,3]
var arr=[];
for (let i = 0; i < fileArr; i++) {
  var fn = new Promise(function(resolve, reject) {
   		setTimeout(function(){
        console.log(a[i]);
      })
      resolve(a[i]);
  })
  
  arr.push(fn);
}

console.log(arr);