Fun with Scala functions (andThen and compose)

Here’s a little fun with Scala functions, including the use of andThen and compose:

scala> val add1 = (i: Int) => i + 1
add1: Int => Int = <function1>

scala> val double = (i: Int) => i * 2
double: Int => Int = <function1>

scala> val addThenDouble = add1 andThen double
addThenDouble: Int => Int = <function1>

scala> addThenDouble(1)
res0: Int = 4

scala> val doubleThenAdd = add1 compose double
doubleThenAdd: Int => Int = <function1>

scala> doubleThenAdd(1)
res1: Int = 3

(Inspired by the book, Functional and Reactive Domain Modeling, and my own book, Learning Functional Programming in Scala.)

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