JavaScript Code

Switch-Case Statement

Switch-case statement is used to execute a block of code among one or more, based on the value of an expression.

Syntax

switch (expression) {
  case a:
    //code
    break;
  case b:
    //code
    break;
  default:
    //code
}

• switch is keyword.
• expression is any expression that evaluates to a values.
• case is keyword.
• a is value that the expression’s result would be matched against.
• b is value that the expression’s result would be matched against.
• code is any valid JavaScript code.
• break is the statement to break the switch-case statement.

The expression is evaluated, and is compared with the case values. if there is a match, then the respective code block is executed. If there is no match, then the default block is executed.

Examples

1. Printing the number in text based on the number’s value.

a = 2

switch (a) {
    case 0:
        console.log("zero");
        break;
    case 1:
        console.log("one");
        break;
    case 2:
        console.log("two");
        break;
    case 3:
        console.log("three");
        break;
    case 4:
        console.log("four");
        break;
    default:
        console.log("unknown number");
}