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:

javascriptswitch (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:

javascriptlet 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;
}

javascriptlet 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');
}