JavaScript Loop to decrement element in last index of Array

October 16, 2022

Array = [ 1, 3, 7, 2 ]

1st Iteration = [ 1, 3, 7, 1 ]
2nd Iteration = [ 1, 3, 7, 0 ]
3rd Iteration = [ 1, 3, 6 ]
4th Iteration = [ 1, 3, 5 ]

So on & so forth…

Final Iteration should be an empty []

I’m wanting to create a loop that takes the last index & decrements the value by 1 on each iteration. When the value in the last index = 0 it should pop it…

Any help would be appreciated.

>Solution :

We can use while and Array.prototype.pop().

function solution(array) {
  while (array.length !== 0) {
    while (array[array.length - 1] >= 1) {
      array[array.length - 1] -= 1;
      console.log(array);
    }
    array.pop();
    console.log(array);
  }
}