Question

How is below loop being incremented ?

for(i <- 1 to 3; j <- 1 to 3) print((10 * i + j) + " ")

Is there an implicit counter using ‘to’ ?

Answer 1

In scala, the for construct is like the “foreach” construct in Java. The following sets i to be each successive item in the given Iterable.

scala> for(i <- Seq(1, 2, 3)) println(i)
1
2
3

The to operator, as in 1 to 3 constructs a Range from 1 to 3:

scala> 1 to 3
res3: scala.collection.immutable.Range.Inclusive = Range(1, 2, 3)