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gustavofranke/currying.scala

Last active August 21, 2018 14:06
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currying.scala
scala> def add: Int => Int => Int = (x: Int) => (y: Int) => x + y
add: Int => (Int => Int)
scala> add(3)(4)
res17: Int = 7
scala> val a = add(3)
a: Int => Int = $$Lambda$1142/734729236@6e49b011
scala> a(4)
res18: Int = 7
scala> def addThree = add(3)
addThree: Int => Int
scala> def addFour = add(4)
addFour: Int => Int
scala> val b = addThree andThen addFour
res19: Int => Int = scala.Function1$$Lambda$1145/429018901@621392ea
scala> b
res20: Int => Int = scala.Function1$$Lambda$1145/429018901@300aa927
scala> b(0)
res21: Int = 7
scala> b(8)
res22: Int = 15
scala> b(1)
res23: Int = 8
scala> b(2)
res24: Int = 9
@gustavofranke
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very nice to see how Function1 forms a monoid with e = identity and op = andThen

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