Set cookie randomizer for API Gateway on AWS

aws-gateway-set-cookie.js

let allArrays = [
  ['S', 's'],
  ['E', 'e'],
  ['T', 't'],
  ['-'],
  ['C', 'c'],
  ['O', 'o'],
  ['O', 'o'],
  ['K', 'k'],
  ['I', 'i'],
  ['E', 'e'],
];

function allPossibleCases(arr) {
  if (arr.length === 1) {
    return arr[0];
  } else {
    let result = [];
    let allCasesOfRest = allPossibleCases(arr.slice(1));  // recur with the rest of array
    for (let i = 0; i < allCasesOfRest.length; i++) {
      for (let j = 0; j < arr[0].length; j++) {
        result.push(arr[0][j] + allCasesOfRest[i]);
      }
    }
    return result;
  }

}