Get random items from array

getRandomItemsFromArray.js

function getRandomItemsFromArray(sourceArray, numOfItems) {
  if (numOfItems > sourceArray.length) {
    throw new Error('Trying to get more items than the array length!!!');
  }
  const shuffledArray = sourceArray.concat().sort((() => Math.random() - 0.5);
  return shuffledArray.slice(0, (numOfItems - 1));
}

// The concat() function returns a copy of the sourceArray so that the original array is not modified.