How would one write object-oriented code in C? [closed]
Yes. In fact Axel Schreiner provides his book “Object-oriented Programming in ANSI-C” for free which covers the subject quite thoroughly.
oop
JavaScript private methods
You can do it, but the downside is that it can’t be part of the prototype: function Restaurant() { var myPrivateVar; var private_stuff = function() { // Only visible inside Restaurant() myPrivateVar = “I can set this here!”; } this.use_restroom = function() { // use_restroom is visible to all private_stuff(); } this.buy_food = function() { … Read more
How should I have explained the difference between an Interface and an Abstract class?
I will give you an example first: public interface LoginAuth{ public String encryptPassword(String pass); public void checkDBforUser(); } Suppose you have 3 databases in your application. Then each and every implementation for that database needs to define the above 2 methods: public class DBMySQL implements LoginAuth{ // Needs to implement both methods } public class … Read more
How should a model be structured in MVC? [closed]
Disclaimer: the following is a description of how I understand MVC-like patterns in the context of PHP-based web applications. All the external links that are used in the content are there to explain terms and concepts, and not to imply my own credibility on the subject. The first thing that I must clear up is: … Read more
What is the purpose of the `self` parameter? Why is it needed?
The reason you need to use self. is because Python does not use special syntax to refer to instance attributes. Python decided to do methods in a way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method is … Read more
What is polymorphism, what is it for, and how is it used?
If you think about the Greek roots of the term, it should become obvious. Poly = many: polygon = many-sided, polystyrene = many styrenes (a), polyglot = many languages, and so on. Morph = change or form: morphology = study of biological form, Morpheus = the Greek god of dreams able to take any form. … Read more
Can we instantiate an abstract class?
Here, i’m creating instance of my class No, you are not creating the instance of your abstract class here. Rather you are creating an instance of an anonymous subclass of your abstract class. And then you are invoking the method on your abstract class reference pointing to subclass object. This behaviour is clearly listed in … Read more
Difference Between Cohesion and Coupling
Cohesion refers to what the class (or module) can do. Low cohesion would mean that the class does a great variety of actions – it is broad, unfocused on what it should do. High cohesion means that the class is focused on what it should be doing, i.e. only methods relating to the intention of … Read more
Examples of GoF Design Patterns in Java’s core libraries
You can find an overview of a lot of design patterns in Wikipedia. It also mentions which patterns are mentioned by GoF. I’ll sum them up here and try to assign as many pattern implementations as possible, found in both the Java SE and Java EE APIs. Creational patterns Abstract factory (recognizeable by creational methods … Read more
What techniques can be used to define a class in JavaScript, and what are their trade-offs?
Here’s the way to do it without using any external libraries: // Define a class like this function Person(name, gender){ // Add object properties like this this.name = name; this.gender = gender; } // Add methods like this. All Person objects will be able to invoke this Person.prototype.speak = function(){ alert(“Howdy, my name is” + … Read more