Node.js is not a programming language per se, but rather a runtime environment for a programming language. It serves as a server-side packaged software, equipped with predefined processes designed for specific tasks.
Node.js has become a go-to technology for heavyweight players such as Netflix and Uber, underlining its high demand in the development world. What makes Node.js so popular?
Non-Blocking I/O Module: Node.js employs a non-blocking I/O module, where I/O stands for input and output. This pivotal feature is a cornerstone of its popularity. In a non-blocking system, while an I/O operation is in progress, other aspects of the application retain access and functionality. Without this feature, operations like retrieving extensive data from a database would render other application functions inactive until completion.
Creating Node.js Scripts: The Power of Modules A fundamental component of Node.js is its module system, which comprises various application programming interfaces (APIs) capable of performing diverse tasks, from console data printing to file manipulation.
One of the most widely-used Node.js modules is the file system module. It empowers developers to create and interact with files on any machine.
Example of Using the File System Module:
// Create a new text file called ‘tasks’ and store ‘buy groceries’ in it
// Import the file system module
const fs = require('fs');
To incorporate the file system module into your Node.js projects, simply import it using the ‘fs’ acronym. This allows you to access the file system module’s functionality.
The file system module offers a plethora of functions, with ‘writeFile’ being showcased in the example above. ‘writeFile’ requires three arguments: a filename, the data to be stored, and a callback function. The callback function handles any potential errors that might occur during the ‘writeFile’ execution.
For instance, if the code from the previous example is stored in a file named ‘index.js,’ executing it (assuming Node.js is installed) involves opening a terminal/console, navigating to the folder containing ‘index.js,’ and entering the following command:
This signifies the successful creation of a new text file named ‘tasks’ containing the text ‘buy groceries,’ residing in the same folder as ‘index.js.’
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