Steps:

  • Loop through the characters in the string
  • Check if the first letter match the last letter
  • Check second letter match the second to last letter
function palindrome(str) {
    for(let i = 0; str.length - i > i; i++) {
        if (str[i] !== str[str.length - 1 - i]) {
            return false;
        }
    }
    return true;
}

palindrome('madam')

References: