I wrote a function very similar to this:
def writeMyEl (x: TypeA, y: TypeB, z : TypeC) {
if (myMutableHashMap.contains((x, y)))
myMutableHashMap(x, y) = z else
myMutableHashMap += (x, y) -> z
}
In real code Types A and B are enumerations and C is a case class. myMutableHashMap is defined as a val
of type scala.collection.mutable.HashMap[(TypeA, TypeB), TypeC]
inside the same class as the writeMyEl
function.
The Scala (2.8) compiler says:
error: too many arguments for method update: (key: (TypeA, TypeB),value: TypeC)Unit
What am I doing wrong?
Try myMutableHashMap((x, y)) = z
. In fact, you don't need the check, since the documentation for +=
says "Adds a new key/value pair to this map. If the map already contains a mapping for the key, it will be overridden by the new value." So your function can just be written as
def writeMyEl (x: TypeA, y: TypeB, z : TypeC) {
myMutableHashMap += (x, y) -> z
}
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