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01: Coding “Java way in Scala” Vs “Scala way in Scala”

Example #1: Read from a list & write to a list

Java Way in Scala


object ListToList extends App {
  
  val inputList = List("Java", "Scala", "Ruby")
  val outputList = scala.collection.mutable.ListBuffer[String]();
  
  for(item <- inputList) {
    outputList += item + " Programming"
  }
  
  println(outputList.toList)
}

object ListToList extends App {

val inputList = List("Java", "Scala", "Ruby")

val outputList = scala.

…

01: Scala Functional Programming basics – pure functions, referential transparency & side effects

Q1. What is a pure function?
A1. A pure function is a function where the following conditions are met:

1) The Input solely determines the output.

2) The function does not change its input.

3) The function does not do anything else except computing the output. This means NO I/O, which is no reading from database, file or input console & no writing to a database, file or output console.…

02: Coding Scala Way – Recursion & Iterator in FP

This extends Coding Scala Way – Part 1 Can you write the following code written in Java the Scala way? Java coding question on recursion and generics Q. Can you…

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02: Scala FP basics: First-class function, higher order function, statements Vs expressions, immutability & recursion

This extends Scala Functional Programming basics – pure functions, referential transparency, side effects, etc.

Q1. What is a first-class function?
A1. A first-class function is a function that can be treated like a value.

1) Can be assigned to a variable as a value can be assigned to a variable.…

02B: Scala FP basics: Explain the below Scala code

Q. Can you explain the concepts used in the below code?


package com.myapp

object Test extends App {

 def numberOfTimes(f: Int => Int, n: Int) : Int => Int = {
    if (n <= 0) (x: Int) => x
    else (x:Int) => numberOfTimes(f, n-1)(f(x))
 }
  val f = (x:Int) => x + 2            

  val f2 = numberOfTimes(f, 3)
  println(f2.apply(5))

…

03: Coding Scala Way – Lazy Eval

Example #6: Lazy initialization & evaluation of code Scala support “views”, which are collections that can be lazily evaluated. One use for views is when you need to traverse a…

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03: Q1 – Q6 Scala interview Q&As on Functional Programming

100+ FAQ Scala interview questions answered with code. Learn more about FP – 6 tips to transforming your thinking from OOP/imperative programming to functional programming (i.e. FP). Scala is very…

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04: Coding Scala Way – Null checks with Option-Some-None

Example #10: Null checks with “Option-Some-None”

Nulls in Scala is a code smell, and a better way to handle null values is with an “Option“, which has 2 sub classes “Some” that has a value and a “None” that does not have a value. Instead of checking for “myVal !=…

04: Currying, partial application & functional composition in Scala

Let’s see how we can wire up functions with & without currying, and then touch on functional composition. Without currying Here are simple functions example that add, add10, multiply and…

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04: Q6 – Q12 Scala FP currying, closures & partial functions interview Q&As

This extends Q1 – Q5 Scala Functional Programming basics interview questions & answers Q6. What is a curried function in Scala? A6. Currying is the technique of transforming a function…

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Blog Archives

01: Coding “Java way in Scala” Vs “Scala way in Scala”

Example #1: Read from a list & write to a list

01: Scala Functional Programming basics – pure functions, referential transparency & side effects

02: Coding Scala Way – Recursion & Iterator in FP

Members Only Content

02: Scala FP basics: First-class function, higher order function, statements Vs expressions, immutability & recursion

02B: Scala FP basics: Explain the below Scala code

03: Coding Scala Way – Lazy Eval

Members Only Content

03: Q1 – Q6 Scala interview Q&As on Functional Programming

Members Only Content

04: Coding Scala Way – Null checks with Option-Some-None

Example #10: Null checks with “Option-Some-None”

04: Currying, partial application & functional composition in Scala

Members Only Content

04: Q6 – Q12 Scala FP currying, closures & partial functions interview Q&As

Members Only Content

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