Kontrollstrukturen

if (condition) {
  // run code if condition is true
} else {
  // run code if condition is false
}

if (condition) {
  // run code if condition is true
} else if (conditon) {
  // run code if first condition is false and second is true
} else {
  // run code if both conditions are false
}

const age = 16;

if (age >= 18) {
  console.log('Levin can start driving license 🚗');
} else {
  const yearsLeft = 18 - age;
  console.log(`Levin is too young. Wait another ${yearsLeft} years.`); // Levin is too young. Wait another 2 years.
}

condition ? exprIfTrue : exprIfFalse

const age = 18;

const drink = age >= 18 ? 'wine 🍷' : 'water 💧';
console.log(`I like to drink ${drink}`); // I like to drink wine 🍷

switch (expression) {
  case expression1:
    // run code if expression is true
  case expression2:
    // run code if expression is true
  case expressionN:
    // run code if expression is true
  default:
    // run code if none of the above expressions are true
}

const day = 'monday';

switch (day) {
  case 'monday':
    console.log('Plan course structure'); // Plan course structure
    console.log('Go to coding meetup'); // Go to coding meetup
    break;
  case 'tuesday':
    console.log('Prepare theory videos');
    break;
  case 'wednesday':
  case 'thursday':
    console.log('Write code examples');
    break;
  case 'friday':
    console.log('Record videos');
    break;
  case 'saturday':
  case 'sunday':
    console.log('Enjoy the weekend :D');
    break;
  default:
    console.log('Not a valid day!');
}