#124
scala> val str = "Physics, Maths" str: String = Physics, Maths scala> val res = str.toUpperCase() res: String = PHYSICS, MATHS scala> val res = str.toUpperCase res: String = PHYSICS, MATHS scala> val res = str toUpperCase:25: warning: postfix operator toUpperCase should be enabled by making the implicit value scala.language.postfixOps visible. This can be achieved by adding the import clause 'import scala.language.postfixOps' or by setting the compiler option -language:postfixOps. See the Scaladoc for value scala.language.postfixOps for a discussion why the feature should be explicitly enabled. val res = str toUpperCase ^ res: String = PHYSICS, MATHS