Cycle array items by random index

gistfile1.txt

function getRandomIndex(len) {
  return Math.floor(Math.random() * Math.floor(len));
}

function cycleArray(arr, i) {
  return arr.slice(i).concat(arr.slice(0, i))
}

function cycleArrayByRandomIndex() {
  return cycleArray(arr, getRandomIndex(arr.length))
}

const arr = ['foo', 'bar', 'fizz', 'buzz']

console.log(cycleArrayByRandomIndex(arr))