CODEWITHSUNDEEP
scalaintellij-idea
ddinchev
ddinchev

Reputation: 34673

Scala worksheet does not evaluate object in IntelliJ IDEA 2016.2

This very simple worksheet content demonstrates the issue:

object Test {
 println("This does not print!")
  add(5, 6)
}

println("This however prints!")
add(5, 6)

def add(a: Int, b: Int): Int = a + b

Results from the above worksheet content are:

defined module Test

This however prints!
res0: Unit = ()
res1: Int = 11

add: add[](val a: Int,val b: Int) => Int

Based on JetBrains official website Scala Worksheets example and every other reliable resource I've found (like Martin Odresky's own examples in Functional Programming in Scala course), I would expect the contents of object Test to execute. My software is:

Upvotes: 7

Views: 6852

Answers (3)

Smalltalkguy
Smalltalkguy

Reputation: 399

I was able to evaluate the Scala work sheet by changing the Scala worksheet settings.

  • change run type to plain (original it was REPL)

You can get to settings by clicking the settings icon on the Scala worksheet.

Upvotes: 15

Jatin
Jatin

Reputation: 31754

I think this is what you want: 

object Test {
  println("This does not print!") 
  add(5, 6)

  println("This however prints!")
  add(5, 6)

  def add(a: Int, b: Int): Int = a + b
}

How the worksheet works is, that if you define an object and nothing defined outside the object scope, it will execute it as Test extends App. Which is what the intellij page displays

If you have any statement outside the object scope, it is then treated as any other object and compiler will initialize it like anything else. This is what you are experiencing.

Upvotes: 9

Samar
Samar

Reputation: 2101

The scala worksheet executes the contents of the object test{....} if all the code is inside that object. If there is some code outside the object, it will just define that Test object (and not run it). 

object Test {
  println("This does not print!")
  def add(a: Int, b: Int): Int = {print("Sum:" + a + b); a + b}
  add(2, 2)
}

// defined the above Test object

Test // executes the Test object

Upvotes: 9

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