How to return early without return statement?

Question

How to write an early-return piece of code in scala with no returns/breaks?

For example

for i in 0..10000000
  if expensive_operation(i)
     return i
return -1

Answer 1

How about

 input.find(expensiveOperation).getOrElse(-1)

Answer 2

You can use dropWhile

Here an example:

Seq(2,6,8,3,5).dropWhile(_ % 2 == 0).headOption.getOrElse(default = -1) // -> 8

And here you find more scala-takewhile-example

With your example

(0 to 10000000).dropWhile(!expensive_operation(_)).headOption.getOrElse(default = -1)`