common functions

common functions.js

/*
isAnagram

Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).
*/
const isAnagram = (str1, str2) => {
  const normalize = str =>
    str
      .toLowerCase()
      .replace(/[^a-z0-9]/gi, '')
      .split('')
      .sort()
      .join('');
  return normalize(str1) === normalize(str2);
};