scala better syntax for map getOrElse

Question

is there a better way to write the code below?

val t = map.get(\'type).getOrElse(\"\"); 
if (t != \"\") \"prefix\" + t;

be interested in inline

Answer 1

You could also use the Scalaz Zero typeclass so your code would look like below. The unary operator is defined on OptionW.

val t = ~map.get('type)                 // no prefix
val t = ~map.get('type).map("prefix"+_) // prefix

Here's an example session:

scala> import scalaz._; import Scalaz._
import scalaz._
import Scalaz._

scala> val map = Map('type -> "foo")
map: scala.collection.immutable.Map[Symbol,java.lang.String] = Map('type -> foo)

scala> ~map.get('type)
res3: java.lang.String = foo

scala> ~map.get('notype)
res4: java.lang.String = ""

scala> ~map.get('type).map("prefix"+_)
res5: java.lang.String = prefixfoo

scala> ~map.get('notype).map("prefix"+_)
res6: java.lang.String = ""