Source code in the miniscript programming language

isPalindrome = function(s)
    // convert to lowercase, and strip non-letters
    stripped = ""
    for c in s.lower
    	if c >= "a" and c <= "z" then stripped = stripped + c
    end for

    // check palindromity
    mid = floor(stripped.len/2)
    for i in range(0, mid)
    	if stripped[i] != stripped[-i - 1] then return false
    end for
    return true
end function

testStr = "Madam, I'm Adam"
answer = [testStr, "is"]
if not isPalindrome(testStr) then answer.push "NOT"
answer.push "a palindrome"
print answer.join