function pickRandomFromArray(arr = [], n = 0) {
  if (n === 0) return [];
  if (arr.length === 0) {
    console.error("Error: Empty array.");
    return [];
  }
  if (arr.length < n) {
    console.error("Error: More elements requested then available.");
    return [];
  }
  if (arr.length === n) {
    console.warn("Warning: Same amout of elements requested as available.");
    console.warn("-> Sorting elements randomly.");
  }

  const randomList = [];
  let originalList = arr;

  for (let i = 0; i < n; i++) {
    // gets a random element from originalList
    let randomEl = originalList[
      Math.floor(Math.random() * originalList.length)
    ];
    // removes picked element from originalList
    originalList = util.removeFromArray(originalList, randomEl);
    // puts picked element in randomList
    randomList.push(randomEl);
  }

  return randomList;
}