switch statement

The switch construct is used to select one value from some range of values.

Syntax

switch (variable) {
	case 'value1':
		/*
			a code located here will be executed
			if the variable has value1
		*/
	break;
	case 'value2':
		/*
			a code located here will be executed
			if the variable has value2
		*/
	break;
	case 'value3':
		/*
			a code located here will be executed
			if the variable has value3
		*/
	break;
	default:
		/*
			a code located here will be executed
			if the variable has some other value
		*/
	break;
};

The comparison is done for strict equality. The default block is optional.

Example

Let's display the user's language depending on the variable lang value:

let lang = 'ru';

switch (lang) {
	case 'ru':
		alert('rus');
	break;
	case 'en':
		alert('eng');
	break;
	case 'de':
		alert('deu');
	break;
	default:
		alert('language not supported');
	break;
};

Example

Let's display the year season, in which the value from the variable falls:

let num = 3;

switch (lang) {
	case 1:
		alert('spring');
	break;
	case 2:
		alert('summer');
	break;
	case 3:
		alert('autumn');
	break;
	case 4:
		alert('winter');
	break;
};

switch statement

Syntax

Example

Example

See also