How to sort a Scala Map by value

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

// 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:

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

Scala

// 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:

How to sort a Scala Map by value

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