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

title, tags

title	tags
palindrome	string,intermediate

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

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

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

palindrome('taco cat'); // true