Difference between map() and flatMap() in Java?

And two coding interview questions based upon map and flatMap

Hello guys, welcome back to our newsletter!

In the past few posts, I have shared popular Java interview questions like,, How ConcurrentHashMap work in Java? Why String is Immutable, why wait() and notify() is called from synchronized context, What is the difference between List, List<Object> , and CyclicBarrier vs CountDownLatch.

Today, we're diving into a fundamental aspect of Java programming: the difference between map() and flatMap() functions.

Whether you're a seasoned developer or just starting your journey with Java, understanding these functions can significantly enhance your coding prowess

This is also a popular Java interview question, so knowing this concept has double benefits.

We will also see coding questions which can be easily solved using functional programming like given an array like [1, 2, 3,4, 5] return another array where each number is square of given number?

I will show you the solution with and without map() but now let’s start with what is map() and flatMap() in Java.

But before that a big news:

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