Yes there are differences which may or may not be relevant in your scenario. Perhaps the most significant is the difference in how members with the same property key are handled when present in both types. Consider: interface NumberToStringConverter { convert: (value: number) => string; } interface BidirectionalStringNumberConverter extends NumberToStringConverter { convert: (value: string) => … Read more
There is a little known feature in TypeScript that allows you to use Mixins to create re-usable small objects. You can compose these into larger objects using multiple inheritance (multiple inheritance is not allowed for classes, but it is allowed for mixins – which are like interfaces with an associated implenentation). More information on TypeScript … Read more
Yes, it is, the syntax is close to C#, here is an example with both default constructor and named constructor: class Foo { Foo(int a, int b) { //Code of constructor } Foo.named(int c, int d) { //Code of named constructor } } class Bar extends Foo { Bar(int a, int b) : super(a, b); … Read more
Yes, you can do it. An interface can extend multiple interfaces, as shown here: interface Maininterface extends inter1, inter2, inter3 { // methods } A single class can also implement multiple interfaces. What if two interfaces have a method defining the same name and signature? There is a tricky point: interface A { void test(); … Read more
If you really want to fake multiple inheritance in PHP 5.3, you can use the magic function __call(). This is ugly though it works from class A user’s point of view : class B { public function method_from_b($s) { echo $s; } } class C { public function method_from_c($s) { echo $s; } } class … Read more
You want to ‘inherit’ from Person’s prototype object: var Person = function (name) { this.name = name; this.type=”human”; }; Person.prototype.info = function () { console.log(“Name:”, this.name, “Type:”, this.type); }; var Robot = function (name) { Person.apply(this, arguments); this.type=”robot”; }; Robot.prototype = Person.prototype; // Set prototype to Person’s Robot.prototype.constructor = Robot; // Set constructor back to … Read more
Short version extends means: The new class is a child. It gets benefits coming with inheritance. It has all the properties and methods of its parent. It can override some of these and implement new ones, but the parent stuff is already included. implements means: The new class can be treated as the same “shape”, … Read more
extends is for extending a class. implements is for implementing an interface The difference between an interface and a regular class is that in an interface you can not implement any of the declared methods. Only the class that “implements” the interface can implement the methods. The C++ equivalent of an interface would be an … Read more