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telekosmos/comprehensions-map-flatmap.scala

Last active January 14, 2022 16:53
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How for comprehensions relate to map/flatMap as syntactic sugar in Scala
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comprehensions-map-flatmap.scala
val l1 = List(1,3,5,7)
val l2 = List(2,4,6,8)
val result = for {
x <- l1
y <- l2
} yield x * y
val flatMapResult = l1.flatMap(i => l2.map(_ * i))
// println(s"result: $result **vs** flatMapResult: $flatMapResult")
val endResult = result.zip(flatMapResult).forall(e => e._1 == e._2)
println(s"End result: both are ${if (endResult) "equals" else "different"}") // equals
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