String problem: You need to find the difference between two strings, the common characters between two strings, or the unique characters in a string.
You can perform all of these operations with built-in methods. Use the
diff method to find the differences between two strings:
val a = "Four score and six years ago" val b = "Four score and seven years ago" a diff b // "ix" b diff a // "vene"
(Notice that the value returned by the
diff method depends on the order in which it’s called.)
intersect method to find the characters that are common between two strings:
val a = "Alvin" val b = "Alexander" a intersect b // yields "Aln" b intersect a // yields "Aln"
distinct method to find the distinct/unique characters in a
"hello world".distinct // yields "helo wrd" "hannah".distinct // yields "han" "Four score and seven".distinct // yields "Four sceandv"
Scala is known for having extensive library support, as you can see from these built-in methods. Remember to review the methods that are available on a
String; if the behavior you need seems common, it’s probably already there.
- You can find more information about these methods in the Scaladoc of the