Leet Code: container-with-most-water

var maxArea = function(height) {
  // declare pointer variables to move from front and back
  // declare area to store max area
  let maxarea = 0;
  let forward = 0;
  let back = height.length - 1;
  // while the pointer moving forward is less than the pointer moving backwards ...
  while(forward < back) {
    // compare the area stored to the area formed by width and the shorter of the two lines indexed by the pointers.
    maxarea = Math.max(maxarea, Math.min(height[forward], height[back]) * (back - forward));
    // increment whichever pointer has a smaller line
    if (height[forward] < height[back]) {
      forward++
    } else {
      back--;
    }
    return maxarea;
  }