Scala sum Map values

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