Adding classes

README.md

@@ -9,6 +9,9 @@ The same line of code but in different languages.
 1. **Variables** (**[PHP](https://github.com/milq/code/blob/master/learn/01/01.php)**, **[JavaScript](https://github.com/milq/code/blob/master/learn/01/01.js)**, **[Python](https://github.com/milq/code/blob/master/learn/01/01.py)**).
 2. **Collections - Arrays/Lists** (**[PHP](https://github.com/milq/code/blob/master/learn/02/02.php)**, **[JavaScript](https://github.com/milq/code/blob/master/learn/02/02.js)**, **[Python](https://github.com/milq/code/blob/master/learn/02/02.py)**).
 3. **Conditionals** (**[PHP](https://github.com/milq/code/blob/master/learn/03/03.php)**, **[JavaScript](https://github.com/milq/code/blob/master/learn/03/03.js)**, **[Python](https://github.com/milq/code/blob/master/learn/03/03.py)**).
+4. **Loops** (**[PHP](https://github.com/milq/code/blob/master/learn/04/04.php)**, **[JavaScript](https://github.com/milq/code/blob/master/learn/04/04.js)**, **[Python](https://github.com/milq/code/blob/master/learn/04/04.py)**).
+5. **Functions** (**[PHP](https://github.com/milq/code/blob/master/learn/05/05.php)**, **[JavaScript](https://github.com/milq/code/blob/master/learn/05/05.js)**, **[Python](https://github.com/milq/code/blob/master/learn/05/05.py)**).
+6. **Classes** (**[PHP](https://github.com/milq/code/blob/master/learn/06/06.php)**, **[JavaScript](https://github.com/milq/code/blob/master/learn/06/06.js)**, **[Python](https://github.com/milq/code/blob/master/learn/06/06.py)**).
 
 I use it only for didactic purposes, it does not cover all the characteristics of each language.
 

learn/06/06.js

@@ -0,0 +1,245 @@
+'use strict'
+
+class Point
+{
+    constructor(x, y)
+    {
+        this._x = x
+        this._y = y
+    }
+
+    get x()
+    {
+        return this._x
+    }
+
+    set x(x)
+    {
+        this._x = x
+    }
+
+    get y()
+    {
+        return this._y
+    }
+
+    set y(y)
+    {
+        this._y = y
+    }
+}
+
+
+
+
+
+class Character
+{
+    constructor(name, max_health)
+    {
+            this._name = name
+            this._x = 50
+            this._y = 50
+            this._max_health = max_health
+            this._health = max_health
+            this._speed = 10
+            this._attack = 8
+            this._defend = 4
+    }
+
+    get name()
+    {
+        return this._name
+    }
+
+    get x()
+    {
+        return this._x
+    }
+
+    get health()
+    {
+        return this._health
+    }
+
+    get attack()
+    {
+        return this._attack
+    }
+
+    move_right()
+    {
+        this._x = this._x + this._speed
+    }
+
+    move_left()
+    {
+        this._x = this._x - this._speed
+    }
+
+    take_damage(damage)
+    {
+        this._health = this._health - damage
+    }
+}
+
+
+
+
+
+
+class Animal
+{
+    constructor(name, energy)
+    {
+        this._name = name
+        this._energy = energy
+    }
+
+    get name()
+    {
+        return this._name
+    }
+
+    get energy()
+    {
+        return this._energy
+    }
+
+    eat()
+    {
+        this._energy = this._energy + 5
+    }
+
+    move()
+    {
+        this._energy = this._energy - 5
+    }
+}
+
+
+
+
+
+class Dog extends Animal
+{
+    constructor(name, energy, sound, breed)
+    {
+        super(name, energy)
+        this._sound = sound
+        this._breed = breed
+    }
+
+    get sound()
+    {
+        return this._sound
+    }
+
+    get breed()
+    {
+        return this._breed
+    }
+}
+
+
+
+
+
+class Cat extends Animal
+{
+    constructor(name, energy)
+    {
+        super(name, energy)
+        this._sound = 'Miaow!'
+    }
+
+    get sound()
+    {
+        return this._sound
+    }
+
+    purr()
+    {
+        this._sound = 'Purr...'
+    }
+}
+
+
+
+
+
+
+// EXAMPLE WITH CLASS POINT
+console.log(' ')
+console.log('POINTS')
+console.log('------')
+
+var point = new Point(2, 3)    // We create an instance (or object) of class Point.
+
+console.log(point.x, point.y)
+
+point.x = 5
+point.y = -4
+
+console.log(point.x, point.y)
+
+
+
+// EXAMPLE WITH CLASS CHARACTER
+console.log(' ')
+console.log('WELCOME, PLAYER!')
+console.log('----------------')
+
+var hero = new Character('Reinwald', 50) // We create an instance (or object) of class Character.
+var evil = new Character('Zarosh', 40)   // We create an instance (or object) of class Character.
+
+hero.move_right()
+hero.move_right()
+
+console.log('The current x position of', hero.name, 'is', hero.x)
+
+evil.take_damage(hero.attack)
+
+console.log('The current hit points of', evil.name, 'is', evil.health)
+
+
+
+// EXAMPLE WITH CLASS ANIMAL AND CLASSES DOG AND CAT (inheritance)
+console.log(' ')
+console.log('ANIMALS')
+console.log('-------')
+
+var ruperta = new Cat('Ruperta', 100)      // We create an instance (or object) of class Cat.
+var chloe = new Cat('Chloe', 75)       // We create an instance (or object) of class Cat.
+
+var ruperta_energy = ruperta.energy
+
+console.log('The energy of', ruperta.name, 'is', ruperta_energy, 'and her sound is', ruperta.sound)
+console.log('The energy of', chloe.name, 'is', chloe.energy, 'and her sound is', chloe.sound)
+
+chloe.move()
+chloe.eat()
+chloe.move()
+
+ruperta.purr()
+
+console.log('Now, the energy of', chloe.name, 'is', chloe.energy)
+console.log('Now, the sound of', ruperta.name, 'is', ruperta.sound)
+
+
+var odessa = new Animal('Odessa', 50)      // We create an instance (or object) of class Animal.
+
+odessa.move()
+odessa.move()
+odessa.move()
+
+console.log('Suddenly,', odessa.name, 'with', odessa.energy, 'of energy appeared!')
+
+
+var toby = new Dog('Toby', 50, 'Woof!', 'Golden Retriever')            // We create an instance (or object) of class Dog.
+var akira = new Dog('Akira', 125, 'Woof, woof!', 'Siberian Husky')     // We create an instance (or object) of class Dog.
+
+console.log(toby.name, 'is a', toby.breed, 'and his sound is', toby.sound)
+console.log(akira.name, 'is a', akira.breed, 'and his sound is', akira.sound)
+console.log(' ')
+