is-anagram.js

const letterMap = {
  "A": 2,
  "B": 3,
  "C": 5,
  "D": 7,
  "E": 11,
  "F": 13,
  "G": 17,
  "H": 19,
  "I": 23,
  "J": 29,
  "K": 31,
  "L": 37,
  "M": 41,
  "N": 43,
  "O": 47,
  "P": 53,
  "Q": 59,
  "R": 61,
  "S": 67,
  "T": 71,
  "U": 73,
  "V": 79,
  "W": 83,
  "X": 89,
  "Y": 97,
  "Z": 101
};

function stringProduct(str) {
  return str
    .toUpperCase()
    .split('')
    .reduce((acc, char) => acc * letterMap[char], 1);
}

function isAnagram(a, b) {
  return stringProduct(a) === stringProduct(b);
}

isAnagram('hello', 'olleh');