See, the dilemma has been solved. One language to rule all of them. But this also takes you to the fact that the entire application is now using the same language. That means you’ve got to have a sound knowledge of that language.
Here are the four bare minimum principles that you should be able to use Node.js effectively in operation.
Non-blocking or Asynchronous I/O
Since Node.js is a server side system, one of its key operations is the handling of browser requests. In conventional I/O systems, a request can only be issued once the response (HTML page) of the previous request has been received. The server blocks other requests, called block I/O, in order to process the current request, which causes the browser to wait (the rotating circle).
Node.js is not implementing this I/O theory. If the request is intended to take longer, Node sends the request to the event loop (which I will explain in more detail in another article) and continues to the next request in the call stack. As soon as the pending request is processed, Node.js will be notified and the response will be made on the browser.
In a language that implements a classical heritage like Java or C++, you first create a class (a blueprint for your objects) and then create objects from that class or expand that class to inherit its properties.
- Core Modules – These are the ones that come pre-compiled with the Node.js library. The purpose of core modules is to provide developers with often occurring and repeating code sections that, if they were not available, would result in a tedious task for developers because they have to write the same code again and again. Some common core modules are HTTP, URL, EVENTS, FILE SYSTEM, etc.
- User Defined Modules – User defined modules are the ones which a developer makes for a specific purpose in his/her application. These are required when the core modules are not capable of fulfilling the desired functionality.
The modules are extracted using the necessary function. If it is a key module, the statement is simply the name of the module. If it is a user defined module, the statement is the path of the module in the file system.
When we pass a callback function as an argument to another function, we just pass the function description, i.e. we never know when the callback function will run. The timing of the execution depends solely on the call function mechanism. It’s “calling back” at a later point of time, hence the name.
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