What are switch-case statements?

Switch-case statements are a type of control flow statement used in programming languages to perform different actions based on the value of a variable or expression. They provide an alternative to using multiple if-else statements when you have a series of conditions to evaluate. Switch-case statements make your code more readable and maintainable by grouping related conditions together.

How do switch-case statements work?

A switch statement evaluates an expression and then executes the code block associated with the value of that expression. Each case in the switch statement represents a possible value of the expression. When the expression matches a case value, the corresponding code block is executed. If none of the case values match the expression, you can provide a default case to handle that situation.

Benefits of using switch-case statements

Switch-case statements offer several advantages over using multiple if-else statements. They are more efficient in terms of performance because the expression is evaluated only once. Switch-case statements also make your code more readable and easier to maintain, especially when dealing with a large number of conditions. Additionally, switch-case statements can help you avoid code duplication by grouping related conditions together.

Examples of switch-case statements in action

Here’s a simple example of a switch-case statement in JavaScript:

«`javascript
let day = 3;
let dayName;

switch(day) {
case 1:
dayName = ‘Monday’;
break;
case 2:
dayName = ‘Tuesday’;
break;
case 3:
dayName = ‘Wednesday’;
break;
default:
dayName = ‘Invalid day’;
}

console.log(dayName); // Output: Wednesday
«`

In this example, the value of the variable `day` is evaluated in the switch statement, and the corresponding day name is assigned to the variable `dayName`. If the value of `day` does not match any of the case values, the default case is executed.