CODEWITHSUNDEEP
scala
reboltutorial
reboltutorial

Reputation:

Is it possible to write loop in Scala Console?

I try to test this in Scala Console (I mean console not script file):

while i < 10 {print(i) i += 1}

It doesn't work. I tried multiple lines it doesn't seem to either.

Am I obliged to use a script file just to test a simple loop ?

Upvotes: 0

Views: 930

Answers (5)

Matt
Matt

Reputation: 17629

As usual, there is more than one way to do this:

// join values beforehand and print the string in one go
println(0 to 9 mkString("\n"))
// using foreach
(0 to 9).foreach(println)
// using for
for(i <- 0 to 9) println(i)

Upvotes: 6

GClaramunt
GClaramunt

Reputation: 3158

On the other hand, Scala encourages you to not use a mutable variable and while + condition

If you want to print the numbers from 0 to 9, use a sequence comprehension :

for (var <- range ) doSomethingWith (var)

In your case will be:

for (i <- 0 to 9) print (i)

(yes, the example looks pretty silly, but it helps to transition to a more "Scalaish" code)

Upvotes: 1

Daniel C. Sobral
Daniel C. Sobral

Reputation: 297205

scala> while i < 10 {print(i) i += 1}
<console>:1: error: '(' expected but identifier found.
       while i < 10 {print(i) i += 1}
             ^

As indicated by the error message, a while must be followed by an "(", as the condition it tests for must be enclosed inside parenthesis. The same thing holds true for "if" and "for", by the way.

Upvotes: 4

Fake Code Monkey Rashid
Fake Code Monkey Rashid

Reputation: 14557

What you want is this:

var i = 0; while (i < 10) { print(i); i += 1 };

Upvotes: 2

Jay Conrod
Jay Conrod

Reputation: 29701

Yes it's possible. You have some syntax errors though:

var i = 0
while (i < 10) { println(i); i += 1 }

Or on multiple lines:

var i = 0
while (i < 10) {
  println(i)
  i += 1
}

Upvotes: 10

Related Questions