/**
 * Fisher-Yates shuffle ES6 non-mutating implementation.
 * @param {Array} array the array to shuffle
 * @return {Array} shuffled array without mutating the initial array.
 */
export const shuffle = (array: any[]): any[] => {
  // perform deep clone on array to mutate
  let cloned = array.slice(0);
  // array to return
  let randomizedArray = [];
  // perform shuffle
  while (cloned.length !== 0) {
    let rIndex = Math.floor(cloned.length * Math.random());
    randomizedArray.push(cloned[rIndex]);
    cloned.splice(rIndex, 1);
  }
  return randomizedArray;
};