Fantom Puzzlers

Here are 6 simple but slightly tricky Fantom questions. For each program on the left select the answer on the right and click next. Try these without actually executing the code :). Safely assume that

• Logging at all levels is on for every problem.
• Logging prints just what’s passed and does not print anything else like current time, level etc

class Parent : GrandParent{
  Void main(){
    g := GrandParent.make
    g.run
  }
}

class GrandParent{
  
  new make(){
    echo("A Grand parent is made")
  }
  
  Void run(){
    echo("zzzz")
  }
}

A Grand parent is made
zzzz

zzzz

class Arrow{
  Log log := Log.get("arrow")
  
  Void main(){
    toStr := 3
    echo(toStr.toStr)
    echo(toStr -> toStr)
    echo(toStr --> toStr)
  }
}

3
3
3

using concurrent

class LogTheError{
  Log log := Log.get("something")

  Void main(){
    a := Actor(ActorPool())|msg|{
        try{
           log.info("called with $msg")
           return msg.toStr
        }
        catch(Err e){
            log.err("something bad", e)
            return "error"
        }
    }
    
    log.info(a.send(2).get)
  }
}

called with 2
2

class Calculator{
   Int a := 0
   Int b := 0
   
   override Str toStr(){
       return "" + (a+b)
    }
} 

class TestCalculator{
   Void main(){
       c := Calculator{a := 10}
       echo(c) 
    }
}

0

10

using [java]java.lang::String as JString

class FFI{
  Void main(){
    obj := JString("test")
    Obj char := obj->charAt(0)
    echo(char.typeof)
  }
}

sys::Int

sys::Str

class Unicode{
  Void main(){
    a := Str["2","\u0001", "3"]
    
    for(i:=0;i<a.size; i++){
      switch(a[i]){
        case "2":
          echo("2")
          break
        case "3":
           echo("3")
           break
        default:
           echo("UNICODE, I HATE YOU")
           break
      }
    }
    
  }
}

2
3
UNICODE, I HATE YOU

2
UNICODE, I HATE YOU
3