The following list provides some of the Important Concepts in NodeJS that every programmer should know.
- Modules in NodeJS
- NodeJS File System
- Events
- Node Package Manager (NPM)
- Callbacks
- Asynchronous I/O (Non-Blocking I/O)
- Promises
- Prototypes
Brief Introduction of Important Concepts in NodeJS
The following section provides a brief introduction of the above-mentioned concepts.
Modules
In fact, NodeJS offers lots of built-in functionality that we can use in our code. Actually these are a set of libraries available in the form of modules.
File System in NodeJS
In fact, the file system in NodeJS is available as a module called ‘fs’. It allows us to read, write and modify the files.
Events
Similarly, NodeJS has a module called as ‘events’ that enable us to do event-driven programming.
Node Package Manager (NPM)
In order to download the packages available in NodeJS, we use Node Package Manager (NPM).
Callbacks
Basically, a callback function is a function that we can pass as an argument to another function. Once, we pass a function as callback, it runs within the function to which it is passed.
Asynchronous I/O in NodeJS
It makes JavaScript execute fast. So, the NodeJS function doesn’t keep incoming requests waiting till the current request is finished. Instead, it accepts other incoming requests while the previous requests are being processed asynchronously.
Promises in NodeJS
Since, we can use asynchronous function calls in NodeJS, so we also need a placeholder for a future return value. Hence, a Promise in NodeJS serves the purpose of the placeholder that will accommodate the result of the asynchronous task. Basically, a Promise is an object that has two properties – state and result.
Prototypes
For the purpose of creating custom objects in JavaScript, we need prototypes.
Further Reading
Understanding NodeJS With Examples
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