inline conditional in scala

[alexmnyc]

Guys, a quick Scala question.

 

What's the equivalent of ? or ?? opertor in Scala as in:

 

val t = "test".length==4 ? "test is of length 4" : "test i not of length 4";

 

val t = string ?? "string is null"

 

 

[Kristof Jozsa]

How about:
val t = if ("test".length == 4) "test is of length 4" else "test i not of length 4"

and
Option(string).getOrElse("string is null")

cheers,

K

 

 

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[Mikhail Strebkov]

1) val t = if ("test".length == 4) "test is of length 4" else "test i not of length 4"

2) for nullable things in scala there is a Option[T] class, so the closest will be:

val fullString = Some("full")

val emptyString = None

val full = fullString.getOrElse("empty")

val empty = emptyString.getOrElse("empty")

P.S. This group probably is not suited to discuss general basic scala question

[alexmnyc]

Thanks guys. I was trying to avoid "if". 

 

I thought maybe I was missing an operator as using "if" felt a little iffy for a functional language somehow so I thought "?" operator was just named into something else and I just could not find in the API docs.

 

Thanks for confirming that "if" is "if" and it is here to stay -)

[Reuben Doetsch]

In scalaz there are conditional operators so you can do

import scalaz._

import Scalaz._

 ("test".length == 4) ? "test is of length 4" | "test i not of length 4" 

[Andreas Joseph Krogh]

Lift comes with its own ternary operator, and it's used like this:

 

import net.liftweb.util.Helpers._

 

(1 == 2) ? "a" | "b"

 

Note that it uses pipe instead of colon as the "else"-branch, because colon is reserved.

 

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[alexmnyc]

Lift helpers looks great. Thank you!

[Naftoli Gugenheim]

On Tuesday, May 21, 2013, alexmnyc wrote:

Thanks guys. I was trying to avoid "if". 

 

I thought maybe I was missing an operator as using "if" felt a little iffy for a functional language somehow so I thought "?" operator was just named into something else and I just could not find in the API docs.

Yes it was renamed to "if." :) Scala was designed to be more consistent than Java, so they unified the "if statement" and the ternary operator, so that there is only the "if expression".

 

Thanks for confirming that "if" is "if" and it is here to stay -)

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