Odd behaviour with scala method syntax
I hit a bit of a quirk of scala's syntax I don't really understand
object Board {
def getObjectAt(x:Int, y:Int):Placeable = return locations(x)(y)
}
works fine. But
object Board {
def getObjectAt(x:Int, y:Int):Placeable {
return locations(x)(y)
}
}
returns the error
Board.scala:8: error: illegal start of declaration
return locations(x)(y)
I found some stuff that says the second form convinces the scala compiler you're trying to specify an expansion to the return type Placeable
. Is there a way I can fix this, or should I just avoid specifying a r开发者_如何学编程eturn type here?
It's just about the function syntax.
If your function has a return value, you'll always define it as an equation (using =), even if a block of computations follows:
object Board {
def getObjectAt(x:Int, y:Int):Placeable = {
return locations(x)(y)
}
}
The notation
def func(...) { ...
is shorthand for return-type Unit
, i.e. a function without return value.
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