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Anonymous Functions in Scala
  • Last Updated : 26 Feb, 2019
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In Scala, An anonymous function is also known as a function literal. A function which does not contain a name is known as an anonymous function. An anonymous function provides a lightweight function definition. It is useful when we want to create an inline function.

(z:Int, y:Int)=> z*y
  • In the above first syntax, => is known as a transformer. The transformer is used to transform the parameter-list of the left-hand side of the symbol into a new result using the expression present on the right-hand side.
  • In the above second syntax, _ character is known as a wildcard is a shorthand way to represent a parameter who appears only once in the anonymous function.

Anonymous Functions With Parameters

When a function literal is instantiated in an object is known as a function value. Or in other words, when an anonymous function is assigned to a variable then we can invoke that variable like a function call. We can define multiple arguments in the anonymous function.

Example 1:

// Scala program to illustrate the anonymous method
object Main 
    def main(args: Array[String]) 
        // Creating anonymous functions
        // with multiple parameters Assign
        // anonymous functions to variables 
        var myfc1 = (str1:String, str2:String) => str1 + str2
        // An anonymous function is created 
        // using _ wildcard instead of 
        // variable name because str1 and
        // str2 variable appear only once 
        var myfc2 = (_:String) + (_:String)
        // Here, the variable invoke like a function call
        println(myfc1("Geeks", "12Geeks"))
        println(myfc2("Geeks", "forGeeks"))




Anonymous Functions Without Parameters

We are allowed to define an anonymous function without parameters. In Scala, We are allowed to pass an anonymous function as a parameter to another function.
Example 2:

// Scala program to illustrate anonymous method
object Main 
    def main(args: Array[String]) 
        // Creating anonymous functions 
        // without parameter 
        var myfun1 = () => {"Welcome to GeeksforGeeks...!!"}
        // A function which contain anonymous 
        // function as a parameter
        def myfunction(fun:(String, String)=> String) = 
            fun("Dog", "Cat")
        // Explicit type declaration of anonymous
        // function in another function
        val f1 = myfunction((str1: String,
                    str2: String) => str1 + str2)
        // Shorthand declaration using wildcard
        val f2 = myfunction(_ + _)


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