Jest is a JavaScript testing framework maintained by Facebook, Inc. Jest is well known for its speed, reliability, and ease of use. It works out of the box for most JavaScript projects. Jest is a complete and ready to set-up JavaScript testing solution. It lets you write tests with an approachable, familiar and feature-rich API that gives you results quickly. Jest is well-documented, requires li..

TreeMap is a sorted map implementation based on a red-black tree. The elements are sorted by their keys, which are inserted into the map using the put() method or can be specified in the constructor. The map is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time, depending on which constructor is used. So what is red-black tree? A red-black tree..

In Java, the final keyword is used to denote constants. It can be used with variables, methods, and classes. Once any entity (variable, method or class) is declared final , it can be assigned only once. Local Changes Never Used Cannot assign a value to final variable(Well ofcourse) One of the most important data structures to know is hashmaps. and how to use them in functional programming can be..