Interfaces are only at compile time. This allows only you to check that the expected data received follows a particular structure. For this you can cast your content to this interface: this.http.get(‘…’) .map(res => <Product[]>res.json()); See these questions: How do I cast a JSON object to a typescript class How to get Date object from … Read more
You want this method: boolean isList = List.class.isAssignableFrom(myClass); where in general, List (above) should be replaced with superclass and myClass should be replaced with subclass From the JavaDoc: Determines if the class or interface represented by this Class object is either the same as, or is a superclass or superinterface of, the class or interface … Read more
You can’t due to type erasure. Java generics are little more than syntactic sugar for Object casts. To demonstrate: List<Integer> list1 = new ArrayList<Integer>(); List<String> list2 = (List<String>)list1; list2.add(“foo”); // perfectly legal The only instance where generic type information is retained at runtime is with Field.getGenericType() if interrogating a class’s members via reflection. All of … Read more
Implement __str__() or __repr__() in the class’s metaclass. class MC(type): def __repr__(self): return ‘Wahaha!’ class C(object): __metaclass__ = MC print(C) Use __str__ if you mean a readable stringification, use __repr__ for unambiguous representations.
The ugly workaround would be to pass a boolean param to Papa indicating that you do not wish to parse the code contained in it’s constructor. i.e: // main class that everything inherits class Grandpa { public function __construct() { } } class Papa extends Grandpa { public function __construct($bypass = false) { // only … Read more
You absolutely can use is in a switch block. See “Type Casting for Any and AnyObject” in the Swift Programming Language (though it’s not limited to Any of course). They have an extensive example: for thing in things { switch thing { case 0 as Int: println(“zero as an Int”) case 0 as Double: println(“zero … Read more
It allows the Entity Framework to create a proxy around the virtual property so that the property can support lazy loading and more efficient change tracking. See What effect(s) can the virtual keyword have in Entity Framework 4.1 POCO Code First? for a more thorough discussion. Edit to clarify “create a proxy around”: By “create … Read more
“Plain Old C# Object” Just a normal class, no attributes describing infrastructure concerns or other responsibilities that your domain objects shouldn’t have. EDIT – as other answers have stated, it is technically “Plain Old CLR Object” but I, like David Arno comments, prefer “Plain Old Class Object” to avoid ties to specific languages or technologies. … Read more
As of Rails 2.3.9, there is a setting in config/application.rb in which you can specify directories that contain files you want autoloaded. From application.rb: # Custom directories with classes and modules you want to be autoloadable. # config.autoload_paths += %W(#{config.root}/extras)
Javac doesn’t actively prohibit this, but it does have a limitation that pretty much means that you’d never want to refer to a top-level class from another file unless it has the same name as the file it’s in. Suppose you have two files, Foo.java and Bar.java. Foo.java contains: public class Foo Bar.java contains: public … Read more