Now let us look into the basic map reduce operations such as Map, Filter, Reduce and Rich Collection API. Problem Statement Get Sum of squares all Even Numbers in a given range val l = (1 to 100).toList val f = l.filter(ele => ele % 2 == 0) val m = f.map(rec => rec * …
As part of this topic we will see one of the important topics for building Spark applications using Scala i.e Collections. Collections Scala collections are categorized into 3 types Seq Set Map Seq Sequence have length Elements in Sequence can be accessed using prefix eg: scala.Array, scala.collection.immutable.List etc Classes are divided into Seq classes and Buffer …
As part of this topic, we will cover Case Classes in Scala Case Class Case classes can be pattern matched Case classes automatically define hashcode and equals Case classes automatically define getter methods for the constructor arguments(if we use var in the argument). Example case class Order(var orderId:Int,var orderDate:String,var orderCustomerId:Int,var orderStatus:String) { println(“I am inside …
As part of this topic we will see about a special type of class called ObjectObject Scala is more object-oriented than Java because in Scala, we cannot have static members. Instead, Scala has singleton objects Object is a keyword which represents singleton class. Creating a Scala objectExample object HelloWorld { def main(args: Array[String]): Unit = { …
In this topic we will see Object Oriented Concepts – Classes Defining a class To define a class in Scala we declare keyword class in front of identifier. Class names should be capitalized.syntax class className Example class Order(orderId: Int, orderDate: String, orderCustomerId: Int, orderStatus: String) { println(“I am inside Order Constructor”) } Disassemble and Decompile Scala code Use the javap command …
In this topic, we will see what are Functions and Anonymous Functions. Functions Let us understand more about Functions in Scala. A function is a group of statements that perform a task We need to give function name, arguments and argument types for regular functions Functions are expressions (not statements) Functions can be returned, passed …
