JavaScript is Palindrome

palindrome.js

const string1 = 'level';
const string2 = 'Le, vel.';

const isPalindrome = (stringToTest1, stringToTest2) => {
  const stringToTestTransformed1 = stringToTest1
      .replace(/[^\w]/gi, '') // replace all non-lettter characters
      .toLowerCase(); // make all characters lower cased

  const stringToTestTransformedAndReversed2 = stringToTest2
      .replace(/[^\w]/gi, '')
      .toLowerCase()
      .split('') // make an array
      .reverse() // revers the array
      .join(''); // make a string
 
  return stringToTestTransformed1 === stringToTestTransformedAndReversed2;
}

isPalindrome(string1, string2); // true