JavaScript - switch statement with example

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

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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.

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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:

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User John is Administrator.