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.)

Add new comment

The content of this field is kept private and will not be shown publicly.

Anonymous format

  • Allowed HTML tags: <em> <strong> <cite> <code> <ul type> <ol start type> <li> <pre>
  • Lines and paragraphs break automatically.
By submitting this form, you accept the Mollom privacy policy.