[JavaScript] Objects

// here we define our method using "this", before we even introduce bob
var setAge = function (newAge) {
  this.age = newAge;
};
// now we make bob
var bob = new Object();
bob.age = 30;
// and down here we just use the method we already made  
bob.setAge = setAge;           // tole vrstico ne razumem najbolje ce mi lahko kdo razlozi    <---
  
// change bob's age to 50 here
bob.setAge(50);               // zakaj tukaj nebi slo ce bi napisal  "setAge(50);" ?           <---

//primer z objektom
bob.setAge(50); // to bi lahko napisali tudi tako setAge.call(bob, 50);
// v tem primeru bi funkcija zagnala bob.age = 50;

//primer brez implicitno definiranega objekta
setAge(50) // to je enako, kot da bi napisal setAge.call(window, 50); ali kot je napisal celebro, bi setAge(50) vrgel napako v strict načinu.
// v tem primeru bi funkcija zagnala window.age = 50;

// Our person constructor
function Person (name, age) {
    this.name = name;
    this.age = age;
}

// We can make a function which takes persons as arguments
// This one computes the difference in ages between two people
var ageDifference = function(person1, person2) {
    return person1.age - person2.age;
};




// Let's bring back alice and billy to test our new function
var alice = new Person("Alice", 30);
var billy = new Person("Billy", 25);

var olderAge = function(person1, person2) {         // Make a new function, olderAge, to return the age of the older of two people
    
        if((person1.age) > (person2.age)){
            return person1.age;
            };
        if ((person1.age) < (person2.age)){
            return person2.age;
            };
        if(person1.age === person2.age){
            return person1.age,person2.age;
            };
    };
    
console.log("The older person is " + olderAge(alice, billy));

korenje3 je 29. dec 2015 ob 04:04 izjavil:

Ne, prvo poda vrednost 50 funkciji setAge(), drugo pa poda vrednost 50 funkciji bob.setAge().
Lahko se delaš še bolj glupega, sam dejstva so dejstva.

// original classes
function Animal(name, numLegs) {
    this.name = name;
    this.numLegs = numLegs;
    this.isAlive = true;
}
function Penguin(name) {
    this.name = name;
    this.numLegs = 2;
}
function Emperor(name) {
    this.name = name;
    this.saying = "Waddle waddle";
}

// set up the prototype chain
Penguin.prototype = new Animal();
Emperor.prototype = new Penguin();

var myEmperor = new Emperor("Jules");

console.log( myEmperor.saying ); // should print "Waddle waddle"
console.log( myEmperor.numLegs ); // should print 2
console.log( myEmperor.isAlive ); // should print true