JavaScript Switch Statement

The JavaScript Switch Statement is a powerful control structure that allows developers to create more concise and readable code when dealing with multiple conditions. Similar to the if-else statement, the switch statement provides an alternative approach to handling different cases in your code. In this article, we’ll delve into the syntax of the switch statement and explore practical examples to illustrate its usage.

Syntax:

The basic syntax of the JavaScript switch statement is as follows:

switch (expression) {
  case value1:
    // code to be executed if expression matches value1
    break;
  case value2:
    // code to be executed if expression matches value2
    break;
  // additional cases as needed
  default:
    // code to be executed if expression doesn't match any case
}

Example 1: Basic Switch Statement
Let’s consider a scenario where we want to determine the day of the week based on a numeric input.

let dayNumber = 3;
let dayName;

switch (dayNumber) {
  case 1:
    dayName = 'Monday';
    break;
  case 2:
    dayName = 'Tuesday';
    break;
  case 3:
    dayName = 'Wednesday';
    break;
  // add cases for other days as needed
  default:
    dayName = 'Invalid day';
}

console.log(`The day is: ${dayName}`);

Example 2: Switch Statement with Multiple Cases
In this example, we’ll use the switch statement to categorize a person’s age range.

let age = 25;
let ageGroup;

switch (true) {
  case age < 18:
    ageGroup = 'Underage';
    break;
  case age >= 18 && age < 30:
    ageGroup = 'Young Adult';
    break;
  case age >= 30 && age < 60:
    ageGroup = 'Adult';
    break;
  default:
    ageGroup = 'Senior';
}

console.log(`The person belongs to the ${ageGroup} age group.`);

Conclusion:
The JavaScript Switch Statement provides a clean and efficient way to handle multiple cases in your code. By using the switch statement, you can make your code more readable and maintainable, especially when dealing with a large number of possible conditions. Experiment with different scenarios and incorporate switch statements into your code to improve its structure and clarity.