JavaScript Reference

Welcome to the JavaScript Reference section! This page provides a comprehensive guide to JavaScript, including its syntax, features, and best practices.

Overview

JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript specification. It is one of the core technologies of the World Wide Web, alongside HTML and CSS.

Features

Dynamic: JavaScript allows you to change HTML elements on the fly.
Interactivity: You can create interactive web pages that respond to user actions.
Event-Driven: JavaScript is primarily used for creating interactive web pages, and is an event-driven scripting language.

Basic Syntax

Here is a simple example of JavaScript syntax:

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

This code will print "Hello, World!" to the console.

Common JavaScript Concepts

Variables

Variables are used to store data values. In JavaScript, you can declare variables using var, let, or const.

var age = 25;
let name = "John";
const pi = 3.14159;

Functions

Functions are blocks of code designed to perform a particular task. You can define your own functions or use predefined ones.

function greet() {
  console.log("Hello!");
}

greet(); // Outputs: Hello!

Loops

Loops are used to repeat a block of code multiple times.

for (let i = 0; i < 5; i++) {
  console.log(i);
}