A function scope is in a way also a block scope, so let and constwould behave the same way they did in our previous examples. However, function scopes also encapsulate variables declared with var .

Node.JS had that ability for a while before it was incorporated in JavaScript with a feature called ‘modules.’ Eventually, they made it to the language itself and the browsers.

Node.js is a lean, fast, cross-platform JavaScript runtime environment that is useful for both servers and desktop applications. Scalability, latency, and throughput are key performance indicators ...