Using a Value (Vanilla) Class When using a value class you need to tell Matlab to store a modified copy of the object to save the changes in the property value. So, >> a=testprop >> a.Request(5); % will NOT change the value of a.numRequests. 5 >> a.Request(5) 5 >> a.numRequests ans = 0 >> a=a.Request; … Read more
You cannot override static methods or fields of any type in Java. public class User extends BaseModel { static String table = “user”; //snip } This creates a new field User#table that just happens to have the same name as BaseModel#table. Most IDEs will warn you about that. If you change the value of the … Read more
C# has a nominal type system, so the compatibility of types is done based on their names. In your example you have two classes with a Quack method, however there is no way to write a method which can take instances of these two classes and invoke their Quack method. In C# 2, the solution … Read more
There’s no formal definition of these concepts, atleast not one that spans all languages. What’s usually common though: clone – create something new based on something that exists. copying – copy from something that exists to something else (that also already exists).
Idiomatic Clojure favors defining independent functions that operate on a very small set of core data structures; this unbundling of methods and data is a strong statement against object orientation and in favour of a functional style. Rich Hickey (creator of Clojure) has repeatedly stated the importance of this; for example here: “Clojure eschews the … Read more
From here, a static call is 4 to 5 times faster than constructing an instance every time you call an instance method. However, we’re still only talking about tens of nanoseconds per call, so you’re unlikely to notice any benefit unless you have really tight loops calling a method millions of times, and you could … Read more
Thoughts: Avoid extending JFrame as it ties your GUI to being, well a JFrame. If instead you concentrate on creating JPanels instead, then you have the freedom to use these JPanels anywhere needed — in a JFrame, or JDialog, or JApplet, or inside of another JPanel, or swapped with other JPanels via a CardLayout. Avoid … Read more
Here’s one way to create that kind of experience: class DotDictify(dict): MARKER = object() def __init__(self, value=None): if value is None: pass elif isinstance(value, dict): for key in value: self.__setitem__(key, value[key]) else: raise TypeError(‘expected dict’) def __setitem__(self, key, value): if isinstance(value, dict) and not isinstance(value, DotDictify): value = DotDictify(value) super(DotDictify, self).__setitem__(key, value) def __getitem__(self, key): … Read more
Since this changes in an event context (points to global usually), you need to store a reference to yourself outside of the event: function Map() { this.x = 0; this.y = 0; var _self = this; $(“body”).mousemove( function(event) { _self.x = event.pageX; // Is now able to access Map’s member variable “x” _self.y = event.pageY; … Read more