557 

   558 

   559 

   560 

   561 

   562 //=======================

   563 // equality is structural

   564 val a = "Dave"

   565 val b = "Dave"

   566 

   567 if (a == b) println("equal") else println("unequal")

   568 

   569 

   570 

   571 List.fill(10)(math.random)

   572 

   573 //------------------------

   574 

   575 

   576 for (a <- 0 to 10) {

   577   println(a)

   578 }

   579 

   580 for (a <- 0 until 10) {

   581   println(a)

   582 }

   583 

   584 for (a <- 0 until 2; b <- 0 to 2) {

   585   

   586 }

   587 

   588 output

   589 a=0, b=0

   590 a=0, b=1

   591 a=0, b=2

   592 a=1, b=0

   593 a=1, b=1

   594 a=1, b=2