madein_problem1.js

// problem 1

function palindromeCheck(s) {
  // remove non alphanumeric chars
  let formatted = s.replace(/[^a-z0-9]/gi,'').toLowerCase();

  let start = 0;
  let end = formatted.length-1;

  while (start < end) {
    if (formatted[start] != formatted[end]) {
      return false;
    }

    start += 1;
    end -= 1;
  }

  return true;
}

const strings = ["oscar", "aaaa", "Racecar", "Madam, I'm Adam"];
for(let i=0; i<strings.length; i++){
  console.log(palindromeCheck(strings[i]));
}