if else Conditional Statements in JavaScript

Conditional Statements in JavaScript if else.

Introduction Conditional statements are an essential part of programming languages like JavaScript. They allow you to execute different blocks of code based on specific conditions. In JavaScript, the primary conditional statements are if, else if, and else. This documentation provides an overview of how to use these conditional statements, along with code examples and explanations.

1. The if Statement The if statement is used to execute a block of code if a specified condition is true. It has the following syntax:

javascript
if (condition) {
    // code to execute if condition is true
}

Example:

javascript
let age = 18;
if (age >= 18) {
    console.log("You are eligible to vote.");
}

Explanation: In this example, the if statement checks if the age variable is greater than or equal to 18. If the condition is true, it executes the code within the curly braces and prints "You are eligible to vote."

2. The if...else Statement The if...else statement allows you to execute different blocks of code based on a condition. If the condition is true, the code inside the if block is executed; otherwise, the code inside the else block is executed. It has the following syntax:

javascript
if (condition) {
    // code to execute if condition is true
} else {
    // code to execute if condition is false
}

Example:

javascript
let hour = 15;
if (hour < 12) {
    console.log("Good morning!");
} else {
    console.log("Good afternoon!");
}

Explanation: In this example, the if statement checks if the hour variable is less than 12. If the condition is true, it prints "Good morning!"; otherwise, it prints "Good afternoon!".

3. The if...else if...else Statement The if...else if...else statement allows you to check multiple conditions and execute different blocks of code accordingly. It has the following syntax:

javascript
if (condition1) {
    // code to execute if condition1 is true
} else if (condition2) {
    // code to execute if condition2 is true
} else {
    // code to execute if all conditions are false
}

Example:

javascript
let marks = 85;
if (marks >= 90) {
    console.log("Excellent!");
} else if (marks >= 70) {
    console.log("Good job!");
} else {
    console.log("Keep improving!");
}

Explanation: In this example, the if statement checks if the marks variable is greater than or equal to 90. If true, it prints "Excellent!"; otherwise, it checks if the marks are greater than or equal to 70 and prints "Good job!". If both conditions are false, it prints "Keep improving!".

Conclusion Conditional statements like if, else if, and else allow you to control the flow of your JavaScript code based on specific conditions. By using these statements effectively, you can create dynamic and responsive programs. Remember to choose appropriate conditions and execute the necessary code blocks to achieve the desired results in your applications.