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<syntaxhighlight lang="Scala">
/// Returns the sum of x and y.
def add(x: Int, y: Int): Int = x + y
/// Returns x plus one.
def inc(x: Int): Int = add(x, 1)
/// Returns a function that applies f twice.
def twice(f: Int -> Int): Int -> Int = x -> f(f(x))
/// Returns x plus two.
def two(x: Int): Int = twice(inc)(x)
/// Returns 123 plus 4 = 127.
def main(): Int = twice(two)(123)
</syntaxhighlight>
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