var arr = [], sum = 0;
for(let count = 0; count < 10000; count++) {
  arr.push(count);
}

arr.shuffle(); // randomize order of elements, mutating operation

for(let i = 0; i < 100000; i++) {
  for(let j = o; j < arr.length; j++) {
    if(arr[j] > 1024) {
      sum += arr[j];
    }
  }
}