Elm

isNegative n = n < 0

isNegative 4 -- true

-- Anon fns
\n -> n < 0

over9000 powerLevel = if powerLevel > 9000 then "It's over 9000!!!" else "meh"

Lists

names = [ "Alice", "Bob", "Chuck" ]

List.isEmpty names

List.length names

List.reverse names

double n = n * 2

nums = [2, 3, 5]

List.map double nums

Tuples