Holger Grosse-Plankermann holgergp
holgergp
/ flatMapTest.sc
Last active
December 15, 2020 13:45
Some fiddling with map, flatMap and foldLeft on Collections, Strings and Option. Trying to understand the generic monadic approach
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| object flatMapTest { | |
| import scala.util.{ Try, Success, Failure } | |
| println("Welcome to the Scala worksheet") //> Welcome to the Scala worksheet | |
| val intList = 1 :: 2 :: 5 :: Nil //> intList : List[Int] = List(1, 2, 5) | |
| intList.map(x => x * 2) //> res0: List[Int] = List(2, 4, 10) | |
| //intList.flatMap(x=>x*2) //type mismatch; found : Int required: scala.collection.GenTraversableOnce[?] | |
| intList.foldLeft(0)((x, y) => x + y) //> res1: Int = 8 | |
| val stringList = "eins" :: "zwei" :: "drei" :: Nil |
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