JavaScript - switch statement with example

The switch statement is used to select and execute some code blocks from defined cases using expression.

1. switch syntax

switch(expression) {
    case x:
        // code block
        break;
    case y:
        // code block
        break;
    case z:
        // code block
        break;

    // other cases...

    default:
        // code block
}

Where:

• expression returns a value that will be compared with cases,
• x, y and z are values that are associated with code blocks,
• if expression maches some case value (x, y or z) than related code block is executed,
• if break instruction is placed after a code block, the next code block is not executed,
• if expression is not matched to any case value default code block is executed.

2. switch statement example

// ONLINE-RUNNER:browser;

var name = 'John';
var role = '';

switch (name) {
    case 'John':
        role = 'Administrator';
        break;
    case 'Kate':
    case 'Chris':
        role = 'Moderator';
        break;
    default:
        role = 'User';
        break;
}

console.log('User ' + name + ' is ' + role + '.');

Output:

User John is Administrator.