String interpolation in Scala?

Question

I wanted to ask if there is any type of string interpolation in Scala. I have made a search on the subject but 'till now I have found that there is no string interpolation. Is there plans to get implemented in next versions?

Thanks!

UPDATE

String interpolation is going to be in scala 2.10 which you can try out since scala 2.10.RC1 is out (20/10/2012). You can check out this SIP for scala 2.11 which states that interpolated strings in the pattern matcher will be valid syntax. With the new string interpolation you can do something like this:

val age = 28
val name = "Gerry"

s"My name is $name and I am $age years old"
res0: String = My name is Gerry and I am 28 years old

But try out the documentation on all the interpolators that are available at the moment. Note that you can define your own interpolators! Try this link for more info.

Answer 1

It's not in the (released) scala library yet. But there is a SIP (Scala Improvement Process) for the addition of this feature:

http://docs.scala-lang.org/sips/pending/string-interpolation.html

Answer 2

You can do it C-style:

"Interpolate my %s here" format List(1,2,3)

//String = Interpolate my List(1, 2, 3) here

or

List(1,2,3) formatted "Interpolate my %s here"

You can use these on anything with a toString (i.e. anything)

case class Foo(n: Int)
Foo(42) formatted "Here is a %s !!!!"
//String = Here is a Foo(42) !!!!

although the former is more flexible in terms of enabling multiple interpolations in a single string (since it can take multiple arguments).

Answer 3

yes, there is string interpolation in current scala releases via compiler plugin see http://jrudolph.github.com/scala-enhanced-strings

Answer 4

I use the xml hack on scala 2.9

val age = 28
val name = "Gerry"

<a>My name is {name} and I am {age} years old</a>.text
res0: String = My name is Gerry and I am 28 years old