[Scala] foldLeft

val ls = (1 to 100).toList

(0 /: ls) ( _ + _)

(0 /: ls) ((x, y) => x + y)

(0 /: ls) ( (x :Int, y :Int) => x + y)

ls.foldLeft(0)((x :Int, y :Int) => x + y)

모두 5050