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01: 19 Java 8 Functional Programming FAQs

Good handle on Java OOP concepts and FP concepts are very important NOT only from writing quality code perspective, but also from job interviews perspective to be able to do well in written tests & technical interviews.

Q1. Can you explain your understanding of Functional Programming (FP)?

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02: Java 8 Streams, lambdas, intermediate vs terminal ops, and lazy loading with simple examples

A stream is an infinite sequence of consumable elements (i.e a data structure) for the consumption of an operation or iteration. Any Collection<T> can be exposed as a stream. It looks complex, but once you get it, it is very simple. The operations you perform on a stream can either...



03: Functional interfaces and Lambda expressions Q&A

The functional interfaces and Lambda expressions are going to make your code concise when coding with Java 8. These are the most awaited features among Java developers. If you understand the following examples, you will know what a lambda expression is & … Read more ›...



04b: 6 Java FP partial functions & currying interview Q&As

Q1. The “java.util.function” package only have “Function<T,R“, which takes an input and returns an output, and “BiFunction<T,U,R>“, which takes two inputs and returns an output. How would you then use a function with 3 or more input arguments? A1. … Read more ›...



05: 7 Java FP (lambda expressions) real life examples in wrangling normal & big data

This post extends Transforming your thinking from OOP to FP. In Big-data, functional programming is prevalent when working with data sets. For example, writing a Spark job to work with RDDs (Resilient Distributed Data sets).

In Imperative (E.g. OOP, procedural programming, etc) programming you can say

where you are assigning x to x + 5.

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06: 5 Java FP interview Q&As on category theory & monoids

Q01. What is a category theory from a functional programming language perspective?
A01. The category theory is all about abstracting complexities in computations. OO is good for abstracting over Data, and FP is good for abstracting over behavior.

Composition

“f” and “g”

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07: 4 Java FP Functors Interview Q&As

Q01. What do you understand by the terms functors, monads, and applicatives ? A01. Functors, Monads, and Applicatives are concepts or patterns that abstract complexities in computations, and are NOT interfaces or classes. You can think of them as container type classes like List<T>, Option<T>, … Read more ›...



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Java Interview FAQs

800+ Java Interview Q&As

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