Uppercase and Lowercase in Scala

In Scala, String objects have built-in methods to change their case:

s.toUpperCase    // converts all characters to uppercase
s.toLowerCase    // converts all characters to lowercase

Here are some examples:

var word = "Hello World"
var upper = word.toUpperCase  // "HELLO WORLD"
var lower = word.toLowerCase  // "hello world"

var name = "ALICE"
println(name.toLowerCase)  // "alice"

These methods return a new String — the original is not modified.