There are many methods in the java.util.ArrayList class in Java. But, two of the overloaded methods set and add at index, are quite interesting. I am writing this post just to tell you a small gotcha of the methods. ArrayList Class The ArrayList as the name suggests is an array but with dynamic size. A static array needs...

The stacks are fundamental data structures. It has many usages from the language compiler, the back button in the web browsers to Undo in a word processor. The stacks use Last In First Out mechanism to insert/add and remove data from it. It can be implemented with either Linked List or Array. We will explore the implementation of...

The var and let keyword can get very confusing and may lead to unexpected behaviors in an application and may also lead to some silly bugs. I will explain what is both and when to use one. Take a look at the code below, function do() { for(var i = 0; i < 5; i++) { console.log(i); }...

    In Elasticsearch, we usually index, update and delete documents quiet frequently. But there are few caveats or catches that you need to look out for if you do it frequently and within short intervals of time. Deletion of a document     The deletion of a document also updates the version of the document. For example,...

The lockdown is not a good place to be in for anyone (* introverts laughing ). We can sleep all day or binge-watch our favorite show on Netflix or play PubG the whole day. The options are many. But ask yourself a question. Will it help you in any way? Are you being productive? What about the extra...