LambdaCase GHC extension introduces a kind of expression that is something of a cross between a
case expression and a lambda.
For example, take this function that converts the
l characters in a string to Greek.
λ> putStrLn (lambdaize "Delightful!") -- Deλightfuλ!
We can write this function more tersely by converting the named function
f into a lambda-case expression: