why can't I call methods on a for-yield expression?
- by 1984isnotamanual
Say I have some scala code like this:
// outputs 1, 4, 9, 16, 25, 36, 49, 64, 81, 100
println( squares )
def squares = {
val s = for ( count <- 1 to 10 ) yield { count * count }
s.mkString(", ");
}
Why do I have to use the temporary val s? I tried this:
def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ")
That fails to compile with this error message:
error: value mkString is not a member of Int
def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ")
Shouldn't mkString be called on the collection returned by the for loop?
