Using Extractors with Pattern Matching In Scala

// Scala program of extractors 
// with pattern matching 

// Creating object 
object GfG 
{ 

    // Main method 
    def main(args: Array[String]) 
    { 

        // Assigning value to the 
        // object 
        val x = GfG(25) 

        // Displays output of the 
        // Apply method 
        println(x) 

        // Applying pattern matching 
        x match
        { 

            // unapply method is called 
            case GfG(y) => println("The value is: "+y) 
            case _ => println("Can't be evaluated") 
    
        } 
    } 
    
    // Defining apply method 
    def apply(x: Double) = x / 5

    // Defining unapply method 
    def unapply(z: Double): Option[Double] =

        if (z % 5 == 0) 
        { 
            Some(z/5) 
        } 
    
        else None 
} 

// Scala program of extractors 
// with pattern matching 

// Creating object 
object GFG
{ 

    // Main method 
    def main(args: Array[String]) 
    { 

        val x = GFG(15)
        println(x)

        x match
        {
            case GFG(num) => println(x + 
                        " is bigger two times than " + num)
        
            // Unapply is invoked
            case _ => println("not calculated")
    }
}
def apply(x: Int) = x * 2
def unapply(z: Int): Option[Int] = if (z % 2 == 0) 
                                    Some(z/2) else None
}