Switch statement in JS.

Switch statement used for multiple way decision making. It checks the value and execute the matching case blocks.

It is compared with each case using strict equality (===), Matching case runs, break stops execution and If no match → default runs. A switch statement can only have one default clause.

Syntax:

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

case value2:
    // code
    break;

default:
    // code

}

Example:

let a = 10;
let b = 5;
let operator = "%";

switch (operator) {
case "+":
console.log(a + b);
break;
case "-":
console.log(a - b);
break;
case "*":
console.log(a * b);
break;
case "/":
console.log(a / b);
break;
default:
console.log("Invalid operator");
}

output : Invalid operator

In this example, that module operator is not in this case so it takes default value as a Invalid operator.