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Scala Keywords

Scala | Keywords: Here, we will learn about various keywords in Scala with examples.
Submitted by Shivang Yadav, on February 02, 2021

Keywords

Keywords are also known as reserved words, keywords are special words for a programming language that have some predefined actions in the programming. Thus, these keywords cannot be used as names for defining objects, classes, functions, variables, etc. The compiler will throw an error if we try to use keywords as identifiers.

Keywords in Scala

Scala programming languages also consist of a set of keywords to help in the efficient working of the program.

There are in total 39 keywords present in Scala. Here is a list of all keywords in Scala,

1. abstract
2. case
3. catch
4. class
5. def
6. do
7. else
8. extends
9. false
10. final
11. finally
12. for
13. forsome
14. if
15. implicit
16. import
17. lazy
18. match
19. new
20. null
21. object
22. override
23. package
24. private
25. protected
26. return
27. sealed
28. super
29. this
30. throw
31. trait
32. try
33. true
34. type
35. val
36. var
37. while
38. with
39. yield

Other than data types are also reserved in Scala.

Example 1: Program to illustrate the use of keyword as identifier (This will return an error)

object MyClass {
    def main(args: Array[String]) {
        val class = 315.12
        val score = class*100 / 500
        
        println("My Score is " + score + "%")
    }
}

Output:

scala:3: error: illegal start of simple pattern
        val class = 315.12
            ^
scala:4: error: '=' expected.
        val score = class*100 / 500
^
scala:4: error: illegal start of simple expression
        val score = class*100 / 500
                    ^