Many template languages have “slots” or “yield” statements, that allow to do some sort of inversion of control to wrap one template inside of another. Angular has “transclude” option. Rails has yield statement. If React.js had yield statement, it would look like this: var Wrapper = React.createClass({ render: function() { return ( <div className=”wrapper”> before … Read more
Are Composition and Inheritance the same? If I want to implement the composition pattern, how can I do that in Java? 17 Answers 17
What are the differences between service orchestration and service choreography from an intra-organization point of view. 11 Answers 11
What is the difference between association, aggregation, and composition? Please explain in terms of implementation. 20 s 20 For two objects, Foo and Bar the relationships can be defined Association – I have a relationship with an object. Foo uses Bar public class Foo { private Bar bar; }; NB: See Fowler’s definition – the … Read more
Why prefer composition over inheritance? What trade-offs are there for each approach? When should you choose inheritance over composition? 3 33
They are absolutely different. Inheritance is an “is-a” relationship. Composition is a “has-a”. You do composition by having an instance of another class C as a field of your class, instead of extending C. A good example where composition would’ve been a lot better than inheritance is java.util.Stack, which currently extends java.util.Vector. This is now … Read more
