composition

Let say I have a class like this: public sealed class Foo { public void Bar { // Do Bar Stuff } } And I want to extend it to add something beyond what an extension method could do....My only option is composition: public class SuperFoo { private Foo _internalFoo; public SuperFoo() { _internalFoo = new Foo(); } public void Bar() { _internalFoo.Bar(); } public void Baz() { // Do Baz Stuff } } While this works, it is a lot of work...however I still run into a problem: public void AcceptsAFoo(Foo a) I can pass in a Foo here, but not a super Foo, because C# has no idea that SuperFoo truly does

I am confused by Delphi 2009/2010 support for the Aero Theme Glass features in Windows, and by what, exactly DoubleBuffered means, and what it has to do with Aero glass. I have found that DoubleBuffered is not only a property in the VCL, it also is found in .net WinForms . Initially I wondered if it set some kind of window style bit used by the common controls library, or what. Why is it used, and when should it be used? [Update: I should state that I know what "double-buffering" is, as a general technique for reduction of flicker, what I wondered is, why does it have ANYTHING to do with

There is a lot of information about composition vs inheritance online, but I haven't found decent examples with JavaScript. Using the below code to demonstrate inheritance: function Stock( /* object with stock names and prices */ ) { for (var company_name in arguments[0]) { // copy the passed object into the new object created by the constructor this[company_name] = arguments[0][company_name]; } } // example methods in prototype, their implementation is probably redundant for // this question, but list() returns an array with toString() invoked; total() // adds up the stock prices and returns

I have been doing SOLID in C# to a pretty extreme level in recent times and at some point realized I'm essentially not doing much else than composing functions nowadays. And after I recently started looking at F# again, I figured that it would probably be the much more appropriate choice of language for much of what I'm doing now, so I'd like to try and port a real world C# project to F# as a proof of concept. I think I could pull off the actual code (in a very un-idiomatic fashion), but I can't imagine what an architecture would look like that allows me to work in a similarly flexible fashion

I am facing a continuing problem distinguishing delegation, composition and aggregation from each other, and identifying the cases where it's the best to use one over the other. I have consulted a Java OO Analysis and Design book, but my confusion still remains. The main explanation is this: Delegation : When my object uses another object's functionality as is without changing it. Composition : My object consists of other objects which in turn cannot exist after my object is destroyed-garbage collected. Aggregation : My object consists of other objects which can live even after my object is

Is it possible to extend only some specific part from multiple classes? Example: class Walker { walk() { console.log("I am walking"); } // more functions } class Runner { run() { console.log("I am running"); } // more functions } // Make a class that inherits only the run and walk functions You can pick and choose which methods from other classes you want to add to an existing class as long as your new object has the instance data and methods that the methods you are adding expect to be on that object. class Walker { constructor() {} walk() { console.log("I am walking"); } // more functions }

I want to do some function composition. I know already this: If f3(x) shall be the same as f1(f2(x)) then f3 = _.flowRight(f1,f2); If f3(x,y) shall be the same as f1(x, f2(y)) then …? (The use case is the composition of node.js/express middleware functions.) In the following images, I use {_} as a placeholder for a value. Think of it as a hole in the code where we pass something in. Ok let's imagine what your function would have to do... Does this seems like a generic transformation? ie, do you think we can use this in many places? – functional programming promotes building functions which are

I am using JSF to render an HTML page. I design the page like it : <f:view xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:p="http://primefaces.org/ui" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> <meta http-equiv="content-type" content="text/html; charset=UTF-8" /> <meta name="language" content="fr" /> <title><ui:insert name="title">My app</ui:insert></title> </h:head> <h:body> <div id="top"> <ui:include src="/header.xhtml"/> </div> <h:panelGroup id="center" layout="block" > <ui:insert name="center"/> </h