String FAQ: How do I convert a
String to uppercase or lowercase, or capitalize the first character in the string?
To convert a
String to uppercase or lowercase, use the
scala> "hello".toUpperCase res0: java.lang.String = HELLO scala> "Hello".toLowerCase res1: java.lang.String = hello
To capitalize the first character of a string, use the
capitalize method, which appears to be on the
scala> val s = "hello world" s: java.lang.String = hello world scala> s.capitalize res2: String = Hello world
With the transparency of the Scala implicit conversion approach, it appears that all three of these methods are in the Java
String class, but the reality is that the
toLowerCase methods are on the Java
String class, but the
capitalize method comes from the Scala
The important thing for you, the developer, is that you can tell which methods are available on a given object. At the time of this writing you can’t see that the
capitalize method is available on a
String in the REPL, but you can see it in Eclipse. Using Eclipse with the Scala IDE plug-in, create a
String like this:
val s = "foo"
s. on the next line of the editor and wait for the code assist dialog to come up (or press Ctrl-Space to display it). The pop-up dialog that appears shows all the implicit methods that are available, including
capitalize and many others.