en/tech_articles/javascript_tutorial

🎉 JavaScript Tutorial

JavaScript is a powerful programming language that runs in the browser and enables dynamic web content. Whether you're a beginner or looking to refine your skills, this guide will walk you through the essentials.

Basic Syntax

JavaScript code is written in scripts, typically enclosed in <script> tags in HTML.

• Hello World Example:

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

  💻 This snippet outputs "Hello, World!" to the console.

Variables

Use let, const, or var to declare variables.

• let for mutable variables:

  let message = "Welcome";  
  message = "Hello"; // Valid  
  

• const for immutable variables:

  const PI = 3.14159;  
  // PI = 3.14; // Invalid (will throw an error)  
  

Data Types

JavaScript supports various data types:

• Primitive: string, number, boolean, null, undefined, symbol
• Object: object, array, function, date, etc.

Functions

Functions are reusable blocks of code.

• Example:

  function greet(name) {  
    return "Hello, " + name + "!";  
  }  
  

  📌 You can call this function with greet("Alice").

Next Steps

Ready to dive deeper? Check out our JavaScript Guide for advanced concepts like closures, promises, and async/await.