Recent questions tagged OOP

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oop - Using sd as a generic function in R

If I a have a class called foo, then it is straightforward to overload the summary function summary.foo = ... way of overloading this function? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - How does Inheritance work in Ruby?

According to Dave Thomas in his talk about the Ruby Object Model, there are no "class methods" in Ruby. ... the inheritance actually take place? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - javascript inheritance from multiple objects

I'm not very well aquainted with javascript inheritance, and I'm trying to make one object inherit from ... sorry for any bad terminology. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - Javascript confusing syntax inconsistence for null, instanceof and typeof?

var obj = {}; typeof obj; // returns "object" obj instanceof Object // return true typeof null ... /Web/JavaScript/Reference/Operators/typeof See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - How do I make many different structs that all implement the same trait comparable to each other?

In Java-lingo, I have an interface R, an interface RT extends R (where RT implements all of R) and ... structs comparable to each other? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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oop - How to dynamically instantiate an object in PHP?

Can we dynamically create and initialize an object in PHP? This is the normal code: class MyClass{ var $var1 ... It threw an exception. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - Should I use, this, self or something else for self identifiers in type definitions?

My guess is that "this" is more C#-ish and in F# it's better to use "self". Are there any required/preferred coding guidelines? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - Javascript "this" in static methods

I have a code like that: User = function(){} User.a = function(){ return "try"; } User.b = function( ... like this to be used in static methods. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - proper class hierarchy for 2D and 3D vectors

I want to have a general vector abstract class / trait that specifies certain methods, e.g.: trait Vec { def + ... way to overcome it in scala? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - PHP equivalent of send and getattr?

If Ruby gets invited to a party and brings: foobarobject.send('foomethod') .. and Python gets invited to the ... about it behind PHP's back? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - function doesn't change object attributes in c++

I am totally new to c++ and thought it would be good practice to write a program which solved a given ... Any help would be greatly appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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993 views

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oop - How can I set a static variable that can be accessed by all subclasses of the same base class (Perl/Moose)?

Since Perl/Moose always calls the base class' BUILD function before it calls the subclass BUILD function, there is ... solution helps for now!) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - Where virtual constructors are used?

I read about virtual constructors are used for implementing some design patterns, but didn't understood any need of ... we really need them? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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968 views

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oop - Python and order of methods in multiple inheritance

In Python, if you define two classes with the same method and intend for those two classes to be parent ... confirming this? Thank you, See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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998 views

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oop - Purpose of final and sealed

Why would anyone want to mark a class as final or sealed? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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oop - Why should we write custom exception classes in Java

What is the purpose of writing custom exception classes when mostly what it does is same. For eg, NullPointerException ... some code than this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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951 views

1 answer

oop - What is the Smalltalk equivalent of Java's static?

What is the Smalltalk equivalent of Java's static fields and methods? IOW, what do the Smalltalkers do when they ... level data and/or methods? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - Get PHP class namespace dynamically

How can I retrieve a class namespace automatically? The magic var __NAMESPACE__ is unreliable since in subclasses it's ... let me know ;) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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oop - PHP Fatal error: Can't inherit abstract function

I don't understand what I'm doing wrong... abstract class Css { abstract protected function parse($data); } ... ok according to the doc... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - Static variable in Javascript that is set only once

I was tearing my hair out to get this done...particularly for an html5 detection script. I wanted a variable that ... please tell me if not :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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985 views

1 answer

oop - PHP MVC: Data Mapper pattern: class design

I have a web MVC application with domain objects and data mappers. The class methods of the data mappers contain ... for your time and patience. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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954 views

1 answer

oop - When to use $this->property instead of $property in PHP

Super easy question. Look at the 2 sample class methods. In the first One I pass in a variable/property call ... this something'. $params; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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960 views

1 answer

oop - Why are JavaScript Primitive-Variables immutable and Object-Variables not?

There is a way to add a member-function or member-property to Number, String, ect...-Variables with the ... the Number-Function called member. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

oop - How do i convert a List<Interface> to List<Class> in c#

I have an interface defined as public interface IReaderInfo { string Displayname {get;} } and a class that implements ... How do i cast it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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oop - Inherit class-level instance variables in Ruby?

I want a child class to inherit a class-level instance variable from its parent, but I can't seem to figure ... be asking too much. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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877 views

1 answer

oop - Where's the difference between self and $this-> in a PHP class or PHP method?

Where's the difference between self and $this-> in a PHP class or PHP method? Example: I've seen this code ... . However, what's the difference? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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893 views

1 answer

oop - Flaw: Constructor does Real Work

I have a class which represents a set of numbers. The constructor takes three arguments: startValue, endValue and ... can't find a solution. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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940 views

1 answer

oop - Creating Object instance from Posted data - PHP

What is the best way of creating and populating an Object from values passed in from a form? If for ... practices is appreciated Cheers Stuart See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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