OOP in New Language
What you will learn
- How to Create a Class
- How to Instantiate a Class
- Write a Constructor and Methods
- Create an Inherited Class
- Write Static Methods/Properties
Below you'll see Javascript examples of Object Oriented Patterns and their new language Counterparts.
Creating and Instantiating a Class
In Javascript
// Creating a Class
class Dog {}
// Instantiation
const Sparky = new Dog();In PHP
<?php
class Dog {}
$sparky = new Dog();The Constructor and Methods
In Javascript
// Creating a Class
class Dog {
// The constructor runs when we instantiate a new instance
constructor(name, age) {
this.name = name;
this.age = age;
}
// A Method
bark() {
console.log(`${this.name} barks`);
}
}
// Instantiation
const Sparky = new Dog("Sparky", 4);
Sparky.bark();in PHP
<?php
class Dog {
// Dec
public $name;
public $age;
// The constructor runs when we instantiate a new instance
public function __construct($name, $age){
$this->name = $name;
$this->age = $age;
}
// A Method
public function bark(){
echo("$this->name barks");
}
}
$sparky = new Dog("Sparky", 4);
$sparky->bark();Inheritance
In Javascript
// Creating a Class
class Dog {
// The constructor runs when we instantiate a new instance
constructor(name, age) {
this.name = name;
this.age = age;
}
// A Method
bark() {
console.log(`${this.name} barks`);
}
}
class SmallDog extends Dog {
constructor(name, age) {
//Super calls the constructor of the parent class
super(name, age);
}
//This will override the version of bark in the parent class
bark() {
console.log(`${this.name} yaps`);
}
}
// Instantiation
const Sparky = new SmallDog("Sparky", 4);
Sparky.bark();in PHP
<?php
class Dog {
// Dec
public $name;
public $age;
// The constructor runs when we instantiate a new instance
public function __construct($name, $age){
$this->name = $name;
$this->age = $age;
}
// A Method
public function bark(){
echo("$this->name barks");
}
}
class SmallDog extends Dog {
public function __construct($name, $age){
#call the constructor of the parent class
parent::__construct($name, $age);
}
# This will override the version of the bark in the parent class
public function bark(){
echo("$this->name Yaps");
}
}
$sparky = new SmallDog("Sparky", 4);
$sparky->bark();Static Methods and Properties
In Javascript
// Static Properties/Methods belong to the class, not the instance
class Calculator {
static lastResult = 0;
static calculate(num1, num2, operator) {
Calculator.lastResult = eval(`${num1} ${operator} ${num2}`);
return Calculator.lastResult;
}
static showLastResult() {
console.log(Calculator.lastResult);
}
}
Calculator.calculate(2, 2, "+");
Calculator.showLastResult();In Python
<?php
// Static Properties/Methods belong to the class, not the instance
class Calculator{
// Properties declared outside the constructor are class/static properties
public static $lastResult = 0;
// Defines this as static method
public static function calculate($num1, $num2, $operator){
self::$lastResult = eval("return $num1 $operator $num2;");
return self::$lastResult;
}
// defines this as static method
public static function showLastResult(){
echo(self::$lastResult);
}
}
//Double colons allow access to static methods/properties
Calculator::calculate(2, 2, "+");
Calculator::showLastResult();