JavaScript Fundamentals 📚

🎉 JavaScript Fundamentals Tutorial

Welcome to the JavaScript basics guide! This tutorial will cover core concepts for beginners.

Variables & Data Types 💡

JavaScript has several data types including:

number 📐 (e.g., 42, 3.14)
string 📝 (e.g., "Hello, world!")
boolean ✅ (e.g., true, false)
null 🚫 (represents no value)
undefined 🤔 (variable declared but not assigned)

Functions 🧠

Use function keyword to define reusable blocks of code:

function greet(name) {
  return `Hello, ${name}!`;
}
console.log(greet("Alice")); // Output: Hello, Alice!

Control Structures 🔄

JavaScript supports:

if/else 🌈 for conditional execution
for/while 🌀 for loops
switch ⚙️ for multiple conditions

Arrays 📁

Arrays store multiple values in a single variable:

let fruits = ["apple", "banana", "cherry"];
console.log(fruits[0]); // Output: apple

Objects 🧩

Objects are key-value pairs:

let person = {
  name: "Bob",
  age: 30,
  greet: function() {
    return `Hi, my name is ${this.name}`;
  }
};
console.log(person.greet()); // Output: Hi, my name is Bob