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

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.

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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.

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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 popular in Apache Spark programming to process Big Data. 70+ FAQ Bigdata & Hadoop interview questions &

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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 multiplyBy10 without currying.

Output:

With currying & partial application with functional composition

Note: You can also do

Output:

What is Currying?

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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 with multiple arguments into a function with just one argument, … Read more ›...



05: Q13 – Q18 Scala FP combinators interview questions & answers

Q13. What are the different approaches in Scala to solve the following task?

Given numbers 1 to 6, and you need to extract out the odd numbers and double them, and finally print the result.

A13. There are 3 ways to solve the problem.

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05: Q27 – Q32 Scala idioms Q&As on Option-Some-None, Try-Success-Failure and Either-Left-Right

Java has idioms like Try-Catch-Finally, Scala has idioms like 1) “Option-Some-None”, 2) Either-Left-Right 3) Try-Success-Failure. Q27. How does Scala try to solve the problem of getting rid of null values & the “NullPointerException”? A27. Scala provides its own type for representing optional values with “Option[A]”, … Read more ›...



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