pancakeSort.js

function flip(arr, right) {
  let temp;
  let left = 0;

  while (left < right) {
    temp = arr[left];
    arr[left] = arr[right];
    arr[right] = temp;

    // scroll
    left+=1;
    right-=1;
  }
}

function findIndexOfMax(array, limit) {
  let target = 0;
  for (let index = 0; index < limit; index+=1) {
    if (array[index] > array[target]) target = index;
  }
  
  return target;
}

function pancakeSort(array) {
  for (let i = array.length; i > 1; --i) {
    let indexOfMax = findIndexOfMax(array, i);
    if (indexOfMax != i) {
      flip(array, indexOfMax);
    }

    flip(array, i - 1);
  }

  return array;
}