Skip to main content

Everything About Object Oriented JavaScript

Complete explanation of Object Oriented JavaScript

01:50 JavaScript Objects
02:36 Objects in Objects
04:12 Constructor Functions
05:58 instanceof
06:28 Passing Objects to Functions
08:09 Prototypes
09:34 Adding Properties to Objects
10:44 List Properties in Objects
11:38 hasOwnProperty
12:42 Add Properties to Built in Objects
14:31 Private Properties
18:01 Getters / Setters
21:20 defineGetter / defineSetter
24:38 defineProperty
27:07 Constructor Function Getters / Setters
29:40 Inheritance
37:13 Intermediate Function Inheritance
39:14 Call Parent Functions
41:51 ECMAScript 6
47:31 Singleton Pattern
49:32 Factory Pattern
52:53 Decorator Pattern
54:52 Observer Pattern



Comments

Post a Comment

Popular posts from this blog

How Does JVM Handle Method Overloading and Overriding Internally

In my previous article Everything About Method Overloading Vs Method Overriding , I have discussed method overloading and overriding, their rules and differences. In this article, we will see How Does JVM Handle Method Overloading And Overriding Internally, how JVM identifies which method should get called. Let’s take the example of parent class  Mammal and a child  Human classes from our previous blog to understand it more clearly. public class OverridingInternalExample { private static class Mammal { public void speak() { System.out.println("ohlllalalalalalaoaoaoa"); } } private static class Human extends Mammal { @Override public void speak() { System.out.println("Hello"); } // Valid overload of speak public void speak(String language) { if (language.equals("Hindi")) System.out.println("Namaste"); else System.out.println("Hello"); } @...

What is Variable Shadowing and Hiding in Java

Java allows us to declare a variable whenever we need it, We can categorize all our variables into 3 categories which have different-different scopes Instance Variables - Defined inside a class and have object level scope. Class Variables - Defined inside a class with static keyword, have class level scope common to all objects of the same class Local Variables - Defined inside a method or in any conditional block, have the block-level scope and only accessible in the block where it defined. What is Variable Shadowing Variable shadowing happens when we define a variable in a closure scope with a variable name and we have already defined a variable in outer scope with the same name. In other words, when a local variable has the same name as one of the instance variable, the local variable shadows the instance variable inside the method block. In the following example, there is an instance variable named x and inside method printLocalVariable(), we are shadowing it by the local ...

AutoWiring Spring Beans Into Classes Not Managed By Spring Like JPA Entity Listeners

In my previous article JPA Auditing: Persisting Audit Logs Automatically using EntityListeners , I have discussed how we can use Spring Data JPA automate Auditing and automatically create audit logs or history records and update CreatedBy, CreatedDate, LastModifiedBy, LastModifiedDate properties. So in order to save history records for our File entity, we were trying to auto-wire EntityManager inside our FileEntityListener class and we have come to know that we can not do this. We can not inject any Spring-managed bean in the EntityListener because EntityListeners are instantiated by JPA before Spring inject anything into it. EntityListeners are not managed Spring so Spring cannot inject any Spring-managed bean e.g. EntityManager in the EntityListeners. And this case is not just with EntityListeners, you can not auto wire any Spring-managed bean into another class (i.e. utility classes) which is not managed by Spring. Because it is a very common problem and can also arise with other c...