JavaScript

What Are JavaScript Statements?

A JavaScript statement is an instruction that the browser executes to perform an action. JavaScript code consists of a series of statements that are executed one by one, in order.

🔹 Example of a simple statement:

let x = 10;  // This is a statement that declares a variable
console.log(x);  // This statement prints x to the console

Types of JavaScript Statements

JavaScript has different types of statements, including:

1️⃣ Declaration Statements (e.g., let, const, var)
2️⃣ Assignment Statements (e.g., x = 5;)
3️⃣ Control Flow Statements (e.g., if, switch)
4️⃣ Looping Statements (e.g., for, while)
5️⃣ Function Statements (function)

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1️⃣ Declaration Statements (Variables & Constants)

These statements declare variables that store values.

🔹 Example:

let name = "John";   // Declares a variable
const PI = 3.14;     // Declares a constant

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2️⃣ Assignment Statements

Assignment statements assign values to variables.

🔹 Example:

let x;     // Declaration
x = 10;    // Assignment

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3️⃣ Control Flow Statements (Conditional Statements)

These statements control decision-making in JavaScript.

🔹 If-Else Statement Example:

let age = 18;

if (age >= 18) {
    console.log("You are an adult.");
} else {
    console.log("You are a minor.");
}

🔹 Switch Statement Example:

let fruit = "apple";

switch (fruit) {
    case "banana":
        console.log("Banana selected.");
        break;
    case "apple":
        console.log("Apple selected.");
        break;
    default:
        console.log("Invalid choice.");
}

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4️⃣ Looping Statements (Loops)

Loops repeat a block of code multiple times.

🔹 For Loop Example:

for (let i = 1; i <= 5; i++) {
    console.log("Count: " + i);
}

🔹 While Loop Example:

let num = 1;
while (num <= 5) {
    console.log("Number: " + num);
    num++;
}

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5️⃣ Function Statements

Functions group reusable code into a block.

🔹 Example:

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

greet("Alice");  // Output: Hello, Alice!

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🚀 JavaScript Statement Rules

✅ Each statement ends with a semicolon (;) (optional but recommended).
✅ JavaScript ignores extra spaces and new lines.
✅ Statements execute in order unless controlled by conditions or loops.

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🔍 Summary of JavaScript Statements

Statement Type	Example	Purpose
Declaration	let x = 10;	Declares variables/constants
Assignment	x = 5;	Assigns values to variables
Conditional	if (x > 10) {}	Controls execution flow
Looping	for (let i = 0; i < 5; i++) {}	Repeats code
Function	function greet() {}	Creates reusable code

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🎯 Conclusion

• JavaScript statements are the instructions that tell the browser what to do.
• Statements can be simple (variable assignment) or complex (loops, functions).
• Using proper syntax and structure helps in writing efficient JavaScript code.