Това е във Judge задачата https://judge.softuni.bg/Contests/Practice/Index/1299#7 ,а това е условието на задачката:

Write a function that receives an array of integers and array of string commands and executes them over the array. The commands are as follows:

• add <index> <element> – adds element at the specified index (elements right from this position inclusively are shifted to the right).
• addMany <index><element 1> <element 2> … <element n> – adds a set of elements at the specified index.
• contains <element> – prints the index of the first occurrence of the specified element (if exists) in the array or -1 if the element is not found.
• remove <index> – removes the element at the specified index.
• shift <positions> – shifts every element of the array the number of positions to the left (with rotation).
• For example, [1, 2, 3, 4, 5] -> shift 2 -> [3, 4, 5, 1, 2]
• sumPairs – sums the elements in the array by pairs (first + second, third + fourth, …).
  • For example, [1, 2, 4, 5, 6, 7, 8] -> [3, 9, 13, 8].
• print – stop receiving more commands and print the last state of the array.

Examples

При командата "shift" по условие трябва да се направи ротация, та ако искаш, може да пробваш да заместиш твоята част от кода на редове 24 и 25 с нещо такова

            let rotations = Number(command[1]);

            for (let j = 0; j < rotations; j++) {

                let element = arrDigit.shift();

                arrDigit.push(element);

            }

и да видиш какво ще се получи.

Мда получи се ,благодаря ти.

Екстра, така и трябваше. Моля.