Ruby on rails – Static method
To declare a static method, write … def self.checkPings # A static method end … or … class Myclass extend self def checkPings # Its static method end end
oop
Calling a super method in PHP
Yes, it’s called parent:: though. public function foo() { parent::foo(); // this is not a static method call, even though it looks like one //do something }
What’s the difference between abstraction and encapsulation?
Abstraction has to do with separating interface from implementation. (We don’t care what it is, we care that it works a certain way.) Encapsulation has to do with disallowing access to or knowledge of internal structures of an implementation. (We don’t care or need to see how it works, only that it does.) Some people …
Why “private” methods in the object oriented?
Lot of good answers, but maybe one more from a self-taught Java programmer as I went through all that by myself with a lot of pain 😉 Think about a Class as something seen from the outside, not as something you see internally. If you look at a Class from the outside, what you see? …
Delete multiple object properties?
ES6 provides an elegant solution to this: Rest in Object Destructuring: let { a, b, …rest } = { a: 10, b: 20, c: 30, d: 40 }; console.log(rest); // { c: 30, d: 40 } Note that this doesn’t mutate the original object, but some folks might still find this useful. Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment
Should I use nested classes in this case?
I would be a bit reluctant to use nested classes here. What if you created an abstract base class for a “multimedia driver” to handle the back-end stuff (workhorse), and a separate class for the front-end work? The front-end class could take a pointer/reference to an implemented driver class (for the appropriate media type and …
Inheriting methods’ docstrings in Python
This is a variation on Paul McGuire’s DocStringInheritor metaclass. It inherits a parent member’s docstring if the child member’s docstring is empty. It inherits a parent class docstring if the child class docstring is empty. It can inherit the docstring from any class in any of the base classes’s MROs, just like regular attribute inheritance. …
How can Inheritance be modelled using C? [duplicate]
It is very simple to go like this: struct parent { int foo; char *bar; }; struct child { struct parent base; int bar; }; struct child derived; derived.bar = 1; derived.base.foo = 2; But if you use MS extension (in GCC use -fms-extensions flag) you can use anonymous nested structs and it will look …
JavaScript: The Good Parts – How to not use `new` at all
Crockford gives an example for an object creation function as should have been provided by JS itself in one of his Javascript talks available on http://developer.yahoo.com/yui/theater/ However, the YUI(3) team itself uses “new”, and they DO follow his recommendations (since he’s the Yahoo chief JS architect (UPDATE: he moved on, but the statement was true …
When to use delegation instead of inheritance? [closed]
When you want to “copy”/Expose the base class’ API, you use inheritance. When you only want to “copy” functionality, use delegation. One example of this: You want to create a Stack out of a List. Stack only has pop, push and peek. You shouldn’t use inheritance given that you don’t want push_back, push_front, removeAt, et …