Created
October 23, 2020 16:54
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ExploreIntersectionTypes
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object ExploreIntersectionTypes { | |
trait Mapper[A, B] { | |
def map(l: List[A])(f: A => B): List[B] = l.map(f) | |
} | |
trait Reducer[A, B >: A] { | |
def reduce(l: List[A])(f: (B, B) => B): B = l.reduce(f) | |
} | |
def mapAndReduce[A, B, C >: B](mR: Mapper[A, B] & Reducer[B, C], l: List[A])( | |
mapFuncf: A => B | |
)(reduceFuncf: (C, C) => C): C = { | |
mR.reduce(mR.map(l)(mapFuncf))(reduceFuncf) | |
} | |
val multBy2: Int => Int = (e: Int) => e * 2 | |
val reduceToSum: (Int, Int) => Int = (a: Int, b: Int) => (a + b) | |
case class MapperAndReducer[A, B, C >: B]() | |
extends Mapper[A, B] | |
with Reducer[B, C] | |
@main | |
def m: Unit = { | |
println( | |
mapAndReduce(MapperAndReducer[Int, Int, Int](), List(1, 2, 3))(multBy2)( | |
reduceToSum | |
) | |
) | |
} | |
} |
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