switch-case construct in JavaScript

Using the switch-case construct, you can run different code, depending on the value of the variable. Here is the syntax for this construct:

switch (variable) {
	case 'value1':
		/*
			here is the code that will be executed 
			if the variable has value1
		*/
	break;
	case 'value2':
		/*
			here is the code that will be executed 
			if the variable has value2
		*/
	break;
	case 'value3':
		/*
			here is the code that will be executed 
			if the variable has value3
		*/
	break;
	default:
		/*
			here is the code that will be executed 
			if it does not match any value
		*/
	break;
}

Let's write a code example with the switch-case construct:

let num = 1;

switch (num) {
	case 1:
		console.log('value1');
	break;
	case 2:
		console.log('value2');
	break;
	case 3:
		console.log('value3');
	break;
	default:
		console.log('incorrect value');
	break;
}

Rewrite the following code with switch-case:

let lang = 'ru';

if (lang == 'ru') {
	console.log('rus');
} else if (lang == 'en') {
	console.log('eng');
} else if (lang == 'de') {
	console.log('deu');
} else {
	console.log('language not supported');
}