palindrome javascript Code Snippet in 2025

Checks if the given string is a palindrome.

• Normalize the string to String.prototype.toLowerCase() and use String.prototype.replace() to remove non-alphanumeric characters from it.
• Use the spread operator (...) to split the normalized string into individual characters.
• Use Array.prototype.reverse(), String.prototype.join('') and compare the result to the normalized string.

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

palindrome('taco cat'); // true