JavaScript use cases in Industry

Summer Task 7.2

What is JavaScript?

JavaScript, often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. JavaScript is high-level, often just-in-time compiled, and multi-paradigm. It has curly-bracket syntax, dynamic typing, prototype-based object-orientation, and first-class functions

Where is it used?

JavaScript lets you add behavior to the web page where the page responds to actions without loading a new page to request processing. It enables the website to interact with visitors and execute complex actions

You can create much more robust servers using Node or the standard server application framework Express.js. Many of the previously mentioned Nodes are actually built using MEAN stack (Mongo Express Angular Node) of which Express is the key component.

Now let's talk about how Uber uses JavaScript ->

To conquer the considerable challenge of ensuring a reliably excellent experience for its customers and drivers at a quickly-growing scale, Uber has built its massive matching system on Node.js. The three core sides of Node.js that made it a good fit for Uber were asynchronous I/O requests handling, quick iterations and the active open source community. Kris Kowal, a Software Engineer at Uber, told also that Node.js is particularly well-suited to writing systems that have all their state in memory as they do not have to externalize the concerns of a distributed system, thus resulting in that the systems can be more available, and they can respond more quickly to requests by eliminating the reading/writing and the serialization of state into a database.

What is NodeJS?

Node.js is an open-source, cross-platform, back-end JavaScript runtime environment that runs on the V8 engine and executes JavaScript code outside a web browser