This changes EVERYTHING! The fact that Javascript is event-driven is the reason for closures, weird scoping/context, and the myriad of callbacks you see everywhere.

Programmers who are new to Javascript – especially Node.js – are often thrown for a loop by the event-driven nature of JS.

The bottom line is: Javascript isn’t built for making a page, it’s built for a user-interface. It listens for user interaction and responds accordingly. And when that response happens, it doesn’t run any unnecessary code…just the code to respond to the user.

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Source: LearnCode.academy

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