30-seconds-of-code/snippets/palindrome.md

palindrome

Returns true if the given string is a palindrome, false otherwise.

Convert string String.toLowerCase() and use String.replace() to remove non-alphanumeric characters from it. Then, use the spread operator (...) to split string into individual characters, Array.reverse(), String.join('') and compare to the original, unreversed string, after converting it String.tolowerCase().

const palindrome = str => {
  const s = str.toLowerCase().replace(/[\W_]/g, '');
  return s === [...s].reverse().join('');
};

palindrome('taco cat'); // true