extend

Overriding a function without removing static properties

由 点点圈 提交于 2019-12-22 05:40:56
问题 If I have a function like this: function a() { console.log('a'); } and then assign a static property like this: a.static = 'foo'; But say I want to override the function with another function like this: var old = a; a = function() { console.log('new'); old.call(this); }; a.static // undefined Since I assigned a new function to a , it’s static properties are lost. Is there a neat way to keep the static properties without looping and manually copying them? Update: Here’s a real world scenario:

How do I extend an NSArray?

由 孤街浪徒 提交于 2019-12-22 05:19:25
问题 Here's my try: H file: @interface Strings : NSArray @end M file: @implementation Strings - (id) init { [self initWithObjects: @"One.", nil]; return self; } @end When I run I get this: 'NSInvalidArgumentException', reason: ' * -[NSArray initWithObjects:count:]: method only defined for abstract class. Define -[Strings initWithObjects:count:]!' This is what I did instead: H file: @interface Strings : NSObject + (NSArray*) getStrings; @end M file: @implementation Strings + (NSArray*) getStrings {

Laravel extending class

由 六眼飞鱼酱① 提交于 2019-12-21 22:44:48
问题 Are there any other steps required to extend a class in Laravel 3? I created application/libraries/response.php : class Response extends Laravel\Response { public static function json($data, $status = 200, $headers = array(), $json_options = 0) { $headers['Content-Type'] = 'application/json; charset=utf-8'; if(isset($data['error'])) { $status = 400; } dd($data); return new static(json_encode($data, $json_options), $status, $headers); } public static function my_test() { return var_dump(

django template: Is extended template able to change css in parent page?

由 空扰寡人 提交于 2019-12-20 14:39:51
问题 I have two django template pages, one of them is "base.html", with basic html tags setup as a base template. Now I have a page "child.html" that extends it, with something like {% extends "base.html" %} in it. Now I have to change <body> background color for this particular page, so in the css of "child.html" I wrote: body { background-color: #000000; /* some other css here */ } But the body doesn't seem to respond to any changes. I think I must have missed something. Please help, thanks.

When to implement and extend? [closed]

由 瘦欲@ 提交于 2019-12-20 08:14:30
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 months ago . When should implement or extend be used? What are some real-world examples? Is this correct? Implementing appears to be a way to enforce that certain methods exists in a class, and that these methods function calls are properly formatted. Implementing is not a way of passing

When to implement and extend? [closed]

由 巧了我就是萌 提交于 2019-12-20 08:13:07
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 months ago . When should implement or extend be used? What are some real-world examples? Is this correct? Implementing appears to be a way to enforce that certain methods exists in a class, and that these methods function calls are properly formatted. Implementing is not a way of passing

Python: Initialize a list of lists to a certain size,

由 耗尽温柔 提交于 2019-12-20 04:16:24
问题 I'm trying to initialize 'big_list', which is a list containing lists, and we know in advance that there will be 200 lists within 'big_list', and that each list will contain only strings or nothing, and that later in the program there will be a loop that appends(one or more times) to only a certain number of those lists. Is there a simplest way to go about this? 回答1: You can use list comprehension for example: big_list = [[] for _ in range(200)] That will create a list containing 200

Extending a delegate from a base class

由 隐身守侯 提交于 2019-12-19 21:18:09
问题 I have an objc base class: @protocol BaseClassDelegate; @interface BaseClass : NSObject @property (nonatomic, weak) id <BaseClassDelegate> delegate; @end @protocol BaseClassDelegate <NSObject> -(void)baseDelegateMethod; @end I am creating a swift sub-class in which I want to extend my delegate... protocol SubClassDelegate : BaseClassDelegate { func additionalSubClassDelegateMethod(); } class SubClass: BaseClass { @IBAction func onDoSomething(sender: AnyObject) { delegate?

Why does jQuery Extend Deep Copy not recursively copy an object?

由 [亡魂溺海] 提交于 2019-12-19 17:27:44
问题 I've searched everywhere and found similar questions with answers that didn't really address my issue so I apologize if this seems like a repeat, but it appears from my experimenting that jQuery's deep copy function doesn't actually work as it's described (or maybe I'm misreading its description). Here's an example demonstrating the problem I'm having: http://jsfiddle.net/wcYsH/ Or this for download: https://github.com/kevroy314/jQuery-Extend-Test Why does the data in the previous copy get

My control is “not allowed here because it does not extend class 'System.Web.UI.UserControl'”

由 谁都会走 提交于 2019-12-19 05:13:06
问题 So I have another noodle-scratcher (for me anyway). I'm trying to create my own custom control in a CMS I only have partial source code for (i.e. samples the vendor has supplied to me). Basically I have created a class called DataDefinitionContent which extends ControlBase . Now, from what I can garner from the metadata, ControlBase extends UserControl , so I would have thought this would run without a drama. Can anyone shed any light on why this might not be working for me? My Class: public
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