Left Rotations

left_rotation.js

function leftRotations(a = [], d = 5) {
  const input = a;
  const arrayLength = input.length;
  const rotation = d;

  for (let index = 0; index < arrayLength; index++) {
    if ((index + 1) <= rotation) {
      let arrayIndex = input.shift();
      input.push(arrayIndex);
    } else {
      break;
    }
  }

  console.log(input);
  return input;
}