shuffleClass.js

const shuffleClass = (arr, num) => {
  if (!Array.isArray(arr) || arr.length === 0) return [];

  if (typeof num !== "number") {
    return arr;
  }

  if (num === 0) {
    return arr;
  }

  if (num >= 1) {
    num = Math.round(num);
    if (num > arr.length) {
      num = num % arr.length;
    }
    for (let i = 0; i < arr.length - num; i++) {
      let removedItem = arr.shift();
      arr.push(removedItem);
    }
  }
  if (num < 0) {
    num = Math.abs(num);
    num = Math.round(num);
    if (num > arr.length) {
        num = num % arr.length;
      }
    for (let i = 0; i < num; i++) {
      let removedItem = arr.shift();
      arr.push(removedItem);
    }
  }

  return arr;
};