function selectRandom()

in index.js [97:113]

• 14 lines of code
• 5 McCabe index (conditional complexity)

function selectRandom(arr, n) {
  const result = [];
  const taken = [];
  let len = arr.length;

  if (n > len) {
    throw `FATAL ERROR: Cannot select ${n} items from array with length ${arr.length}`;
  }

  while (n--) {
    let idx = Math.floor(Math.random() * len);
    result[n] = arr[idx in taken ? taken[idx] : idx];
    taken[idx] = --len in taken ? taken[len] : len;
  }

  return result;
}