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Scala sum Map values

  • Last Updated : 26 Jul, 2019

In Scala, the sum of the map elements can be done by utilizing foldLeft method.

Syntax : m1.foldLeft(0)(_+_._1)

Here, m1 is used for a Map, foldLeft is a method that takes an initial value zero. it will take previous result and add it to the next map key value.

Return Type: It returns the sum of all the elements of the map.

Example #1:






// Scala program of sum()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map(3 -> "geeks", 1 -> "for", 2 -> "cs")
          
        // Applying sum method
        val result = m1.foldLeft(0)(_+_._1)
          
        // Displays output
        println(result)
      
    }
}
Output:
6

Here, zero in the foldLeft method is the initial value.
Example #2:




// Scala program of sum()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map(3 -> "geeks", 1 -> "for", 1 -> "for")
          
        // Applying sum method
        val result = m1.foldLeft(0)(_+_._1)
          
        // Displays output
        println(result)
      
    }
}
Output:
4



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