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Concatenate Two Maps in Scala

  • Last Updated : 13 Aug, 2019

The concatenation of Scala map is obtained by utilizing ++ operator.
Syntax :

def ++(xs: Map[(A, B)]): Map[A, B]

Return Type:
It returns a single map by concatenating two maps but it separates the identical keys.
Example #1:




// Scala program of concatenating
// two maps
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating the first map
        val m1 = Map("Nidhi" -> 23, "Rahul" -> 18
          
        // Creating the second map
        val m2 = Map("Geeta" -> 22, "Rahul" -> 18
          
        // Applying ++ operator
        val result = m1.++(m2)
          
        // Displays output
        println(result)
      
    }
}
Output:
Map(Nidhi -> 23, Rahul -> 18, Geeta -> 22)

As we can see in above example, we joined two maps by using ++ operator.
Example #2:




// Scala program of concatenating
// two maps
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating the first map
        val m1 = Map("geeks" -> 5, "for" -> 3
          
        // Creating the second map
        val m2 = Map("geeks" -> 5, "cs" -> 2
          
        // Applying ++ operator
        val result = m1.++(m2)
          
        // Displays output
        println(result)
      
    }
}
Output:
Map(geeks -> 5, for -> 3, cs -> 2)



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