Menu
Can I "yield" into a Map?
I've tried
val rndTrans = for (s1 <- 0 to nStates; s2 <- 0 to nStates if rnd.nextDouble() < trans_probability) yield (s1 -> s2); (and with , instead of ->) but I get the error
TestCaseGenerator.scala:42: error: type mismatch; found : Seq.Projection[(Int, Int)] required: Map[State,State] new LTS(rndTrans, rndLabeling) I can see why, but I can't see how to solve this :-/
360
yield keyword will returns a result after completing of loop iterations. The for loop used buffer internally to store iterated result and when finishing all iterations it yields the ultimate result from that buffer.
Language. Scala offers a lightweight notation for expressing sequence comprehensions. Comprehensions have the form for (enumerators) yield e , where enumerators refers to a semicolon-separated list of enumerators. An enumerator is either a generator which introduces new variables, or it is a filter.
map() method is a member of TraversableLike trait, it is used to run a predicate method on each elements of a collection. It returns a new collection.
scala> (for(i <- 0 to 10; j <- 0 to 10) yield (i -> j)) toMap res1: scala.collection.immutable.Map[Int,Int] = Map((0,10), (5,10), (10,10), (1,10), (6,10), (9,10), (2,10), (7,10), (3,10), (8,10), (4,10)) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
