Scala – Monads

  • date 28th April, 2021 |
  • by Prwatech |
  • 0 Comments

In Scala, Monads is a development which performs progressive computations. It is an object which covers the other object. Monad is not a class nor a trait, it is an idea. Maximum collections of Scala are Monads yet not every one of the Monads are collections, there are a few Monads which are compartments like Options in Scala. So, we can say that in Scala the information types that carries out map just as flatMap() like Options, Lists, and so on are called as Monads.

Use case 1:

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

    // Creating list of numbers
    val list1 = List(1, 2, 3, 4)
    val list2 = List(5, 6, 7, 8)

    // Applying 'flatMap' and 'map'
    val z = list1 flatMap { q => list2 map {
            r => q + r
    }
    }

    // Displays output
    println(z)

}
}

Output

List(6, 7, 8, 9, 7, 8, 9, 10, 8, 9, 10, 11, 9, 10, 11, 12)

Use case 2:

    object prwatech
    { 
    // Main method
    def main(args:Array[String])
    {   
    // Creating list of numbers
    val x = (1 to 5).toList
    val y = (1 to 6 by 2).toList

    // Applying 'flatMap'and 'map'
    val z = x flatMap { s => y map { 
                t => s * t 

    }
    }

    // Displays output
    println(z)
}
}

Output

List(1, 3, 5, 2, 6, 10, 3, 9, 15, 4, 12, 20, 5, 15, 25)

Use case 3:

    object prwatech
    {
    // Main method
    def main(args:Array[String])
    {
    // Creating list of numbers
    val a = (1 to 5 by 2).toList
    val b = (1 to 6 by 2).toList

    // Applying 'flatMap'and 'map'
    val x = a flatMap { y => b map { 
                t => y * t 

    }
    }

    // Displays output
    println(x)
}
}

Output

List(1, 3, 5, 3, 9, 15, 5, 15, 25)

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