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About Perl

Perl is a family of two high-level, general-purpose, interpreted programming languages.

About Haskell

Haskell is a purely functional programming language.

Palindrome Check Example: Perl vs Haskell

Palindrome Check in Perl

sub is_palindrome {
    my $str = shift;
    $str =~ s/[^a-zA-Z0-9]//g;
    $str = lc($str);
    return $str eq reverse($str);
}

# Example usage
print is_palindrome("A man, a plan, a canal: Panama") ? "true\n" : "false\n";
print is_palindrome("race a car") ? "true\n" : "false\n";

Palindrome Check in Haskell

import Data.Char (isAlphaNum, toLower)

isPalindrome :: String -> Bool
isPalindrome str = clean == reverse clean
  where clean = map toLower $ filter isAlphaNum str

main :: IO ()
main = do
  print $ isPalindrome "A man, a plan, a canal: Panama" -- True
  print $ isPalindrome "race a car" -- False

Bubble Sort Example: Perl vs Haskell

Bubble Sort in Perl

sub bubble_sort {
    my @arr = @_;
    my $n = scalar @arr;
    for my $i (0..$n-1) {
        for my $j (0..$n-$i-2) {
            if ($arr[$j] > $arr[$j+1]) {
                @arr[$j,$j+1] = @arr[$j+1,$j];
            }
        }
    }
    return @arr;
}

my @arr = (64, 34, 25, 12, 22, 11, 90);
print join(" ", bubble_sort(@arr)) . "\n";

Bubble Sort in Haskell

bubbleSort :: Ord a => [a] -> [a]
bubbleSort xs = foldr (\_ -> bubble) xs [1..length xs - 1]
  where
    bubble [] = []
    bubble [x] = [x]
    bubble (x:y:xs)
      | x > y     = y : bubble (x:xs)
      | otherwise = x : bubble (y:xs)

main :: IO ()
main = print $ bubbleSort [64, 34, 25, 12, 22, 11, 90]