Switch

Learn how to select one block of code from multiple possible options using the JavaScript switch statement.

What is switch?

The switch statement evaluates an expression and compares its value with different case values.

When a matching case is found, its code executes. The break statement normally stops execution from continuing into the next case.

A switch statement helps a program choose from multiple options.

Main Parts of switch

Basic Syntax

switch (expression) {
    case value1:
        // code
        break;

    case value2:
        // code
        break;

    default:
        // code
}

How switch Works

Example 1: Days of the Week

In this example, the switch statement checks a number and prints the corresponding day.

const day = 2;

switch (day) {
    case 1:
        console.log("Monday");
        break;

    case 2:
        console.log("Tuesday");
        break;

    case 3:
        console.log("Wednesday");
        break;

    default:
        console.log("Invalid Day");
}

Output

Example 2: Course Selection

A switch statement can also be used to select an action based on a course code.

const courseCode = "JS";

switch (courseCode) {
    case "JAVA":
        console.log("Java Full Stack");
        break;

    case "DOTNET":
        console.log(".NET Full Stack");
        break;

    case "JS":
        console.log("JavaScript Full Stack");
        break;

    default:
        console.log("Course Not Found");
}

Output

Important Note