This article is going to highlight the key concepts that a Node.js programmer should know.
Asynchronous or Non-blocking I/O
Being a server-side framework, one of the main operations of Node.js is to handle all the browser requests efficiently. Well, Node.js does not follow the traditional principle of I/O. Here’s how the Node.js architecture works.
When a request takes longer time, Node.js sends it in the event loop and moves to call stack to attend the next request. The moment the pending request is done processing, the response is rendered on the browser.
Check out the following dummy example to understand this better.
Have you worked with packages in Java? If yes, then you will find no difference at all with the modules in Node.js.
- Core modules
Core modules are pre-compiled and are available in the Node.js library. The main objective of these modules is to save the developers from the tedious task of writing repetitive codes. Some of the common core modules are URL, HTTP, FILE SYSTEM, EVENTS, etc.
- User-defined modules
Every application is built to meet certain objectives or goals. Sometimes the core modules are not enough to fulfill the desired functionality. This is when developers need user-defined modules.
Check out the image below for better understanding.
Check out the following sample code to understand it better.
When a callback function is passed as an argument to another function, only the function definition is passed. The timing of the callback function execution entirely depends on the calling function’s mechanism. This is the sole basis of the asynchronous or non-blocking behavior of the Node JS framework.
- Aspect-oriented programming
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