Map Implementation

let numbers = [1, 2, 3, 4, 5, 6, 7, 8];

function operateArray(arr) {
  let modifiedArr = [];

  for (let i = 0; i < arr.length; i++) {
    let currentElement = arr[i];

    modifiedArr[modifiedArr.length] = currentElement * 2;
  }
  return modifiedArr;
}

let result = operateArray(numbers);
console.log(result);