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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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...
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 ›...
Why convert from a list to a map? Maps allow you to store and access data by a “KEY”. Lists only allow you to access data by either index or by looping through the whole list to find a value that you are interested in. … Read more ›...
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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Requirements gathering Does the array allow duplicates? If duplicates are allowed, then do you need to report duplicates? For example, in {2,4, 6, 3, 6, 5}, is 6 or 5 the second highest? Analysis If duplicates are not allowed, sort the array (Arrays.sort(…)) and get the second last element, …...
Output:
#1 double colon notation ::
The new double colon (::) operator that Java 8 has to convert a normal method into lambda expression. So,
Instead of:
You can do:
#2 Why is stream::iterator used?…
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