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Node.js First Example

Node.js is a cross-platform, open-source environment that executes JavaScript outside of the browser. It allows developers to use JavaScript to write server-side scripts. In this tutorial, we'll go over a basic "Hello, World!" example to demonstrate how to use Node.js.

Syntax

The syntax for creating a "Hello, World!" program in Node.js is as follows:

console.log("Hello, World!");

This code simply logs the string "Hello, World!" to the console.

Example

Let's create a new file called app.js and add the "Hello, World!" code to it:

console.log("Hello, World!");

Save the file and then open the terminal. Navigate to the directory where the file is saved and type the following command:

node app.js

This will run the script in the Node.js environment and log the message "Hello, World!" to the console.

Output

When we run the example code above using Node.js, the output will be:

Hello, World!

This is because the console.log() method is used to log the string "Hello, World!" to the console.

Explanation

In the example above, we created a new file called app.js and added the "Hello, World!" code to it. We then ran the script in the Node.js environment using the node app.js command. The console.log() method was used to log the string "Hello, World!" to the console.

Use

Node.js is commonly used for building web applications, command-line tools, and server-side scripts. It's useful for interacting with databases, handling requests, and processing data.

Important Points

  • Node.js is built on the V8 JavaScript engine from Google Chrome.
  • Node.js is non-blocking, meaning it can handle multiple requests at the same time without blocking other requests.
  • Node.js has a built-in module system for loading external modules.
  • Node.js uses an event-driven architecture that allows for efficient and scalable programming.

Summary

In this tutorial, we went over a basic "Hello, World!" example to demonstrate how to use Node.js. We covered the syntax, example, output, explanation, use, and important points of Node.js. With this knowledge, you can now write simple programs in Node.js and start exploring its many features and capabilities.

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