reduce list of integers/range of integers in scala

Question

Total newbie question here...Today while trying to calculate sum of a list of integers(actually BitSet), I ran into overflow scenarios and noticed that the return type of(sum/product) is Int. Are there any methods in Range/List to sum up or say multiply all values to Long?

val x = 1 to Integer.MaxValue
println(x.sum) //prints -1453759936

thanks

Answer 1

Convert the elements to Long (or BigInt should that go that far) while summing:

x.view.map(_.toLong).sum

You can also go back to fold

x.foldLeft(0L)(_ + _)

(Note: should you sum over a range, maybe it would be better do a little math, but I understand that is not what you did in fact)