Palindrome detection

Built-in

say "noon".is_palindrome    # true

Non-recursive

func palindrome(s) {
    s == s.reverse
}

Recursive

func palindrome(s) {
    if (s.len <= 1) {
        true
    }
    elsif (s.first != s.last) {
        false
    }
    else {
        __FUNC__(s.ft(1, -2))
    }
}