(function() {
    console.log("This runs immediately!");
})();

function* generator() {
    yield 1;
    yield 2;
    yield 3;
}
const gen = generator();
console.log(gen.next().value); // 1
console.log(gen.next().value); // 2

function ask(question, no, yes){
  if(confirm(question))yes()
  else no()
}
ask("do you agere?"
  function(){alert{"You agreed!"}; },
  function(){alert{"You canceled the execution!"}; }
);

let userName = prompt("Your name?", "Alice");
let isTeaWanted = confirm("Do you want some tea?");

alert( "Visitor: " + userName ); // Alice
alert( "Tea wanted: " + isTeaWanted ); // true

let isBoss = confirm("Are you the boss?");

alert( isBoss ); // true if OK is pressed

let user = {     // an object
  name: "John",  // by key "name" store value "John"
  age: 30        // by key "age" store value 30
};

function makeUser(name, age) {
  return {
    name: name,
    age: age,
    // ...other properties
  };
}

let user = makeUser("John", 30);
alert(user.name); // John

let user = {
  name: "John",
  age: 30
};

user.sayHi = function() {
  alert("Hello!");
};

user.sayHi(); // Hello!

let user = {
  name: "John",
  age: 30,

  sayHi() {
    // "this" is the "current object"
    alert(this.name);
  }

};

user.sayHi(); // John

let user = {
  name: "John",
  age: 30,

  sayHi() {
    alert(user.name); // "user" instead of "this"
  }

};

function sayHi() {
  alert( this.name );
}

function BigUser() {

  this.name = "John";

  return { name: "Godzilla" };  // <-- returns this object
}

alert( new BigUser().name );  // Godzilla, got that object