extend

I have done some research on the ExtJS forum regarding private methods and fields inside a extended class , and I couldn't find any real answer to this. And when I say an extended class I mean something like this: Ext.ux.MyExtendedClass = Ext.extend(Ext.util.Observable, { publicVar1: 'Variable visible from outside this class', constructor: function(config) { this.addEvents("fired"); this.listeners = config.listeners; }, // to show that I need to use the base class publicMethod1: function() { return 'Method which can be called form everywhere'; }, publicMethod2: function() { return this

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 variables or "settings" to the class though? Expected real-life scenario: I have an e-commerce platform featuring multiple payment classes that all follow the same design. When a new payment class should be added, it's really easy to follow the defined design of the interface to ensure that all bits and pieces are there,

I need to understand why : years = range(2010,2016) years.append(0) is possible, returning : [2010,2011,2012,2013,2014,2015,0] and years = range(2010,2016).append(0) or years = [0].extend(range(2010,2016)) doesn't work ? I understand that it is a type error from the message I got. But I'd like to have a bit more explanations behind that. You are storing the result of the list.append() or list.extend() method; both alter the list in place and return None . They do not return the list object again. Do not store the None result; store the range() result, then extend or append. Alternatively, use

I know that my question needs a little more clarification, so let me explain: When I visited the jquery api documentation for $.fn.extend, I was personally blown away by how easy it was to create a custom jquery function like this: $('input[type="checkbox"]').check(); Link here: http://api.jquery.com/jquery.fn.extend/ But if you wanted to add functionality to the function like this (pun intended): check({ timer: 1000, redo: 4000, displayAt: 'someID' }); // filler parameters How would you do that, exactly? Also, how would you create a function like check({ ... }); that does not rely on any

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?.additionalSubClassDelegateMethod(); <--- No such method in 'delegate' } } Now, when I create my sub-class, I can say it

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 changed when the deep copy is manipulated? For one, you aren't creating normal objects. I'm looking at

I tried to extend a list and was puzzled by having the result return with the value None. What I tried was this: >>> a = [1,2] >>> b = [3,4] >>> a = a.extend(b) >>> print a None I finally realized that the problem was the redundant assignment to 'a' at the end. So this works: >>> a = [1,2] >>> b = [3,4] >>> a.extend(b) >>> print a [1,2,3,4] What I don't understand is why the first version didn't work. The assignment to 'a' was redundant, but why did it break the operation? Because, as you noticed, the return value of extend is None . This is common in the Python standard library; destructive

jQuery为开发插件提供了两种方法，分别是： jQuery.fn.extend(object); jQuery.extend(object); jQuery.extend(object); 为扩展jQuery类本身.为类添加新的方法。 jQuery.fn.extend(object);给jQuery对象添加方法。 jQuery.extend(object);　为jQuery类添加添加类方法，可以理解为添加静态方法。如： jQuery.extend({ min: function(a, b) { return a < b ? a : b; }, max: function(a, b) { return a > b ? a : b; } }); jQuery.min(2,3); // => 2 jQuery.max(4,5); // => 5 便为　jQuery　添加一个为 add　的　“静态方法”，之后便可以在引入 jQuery　的地方，使用这个方法了， jQuery.fn.extend(object); 对jQuery.prototype进得扩展，就是为jQuery类添加“成员函数”。jQuery类的实例可以使用这个“成员函数”。 比如我们要开发一个插件，做一个特殊的编辑框，当它被点击时，便alert 当前编辑框里的内容。可以这么做： $.fn.extend({

jQuery 为开发插件提供了两个方法，分别是： 1. jQuery.fn.extend()：给 jQuery对象 提供方法。 2. jQuery.extend()：为扩展 jQuery类本身 添加方法。 先看源码是怎么实现的，截取自JQuery-1.11.0,不想看，可以直接越过。。 源码截取出来了，中文地方为我加的说明 jQuery.extend = jQuery.fn.extend = function() { var src, copyIsArray, copy, name, options, clone, //target初始化为取第一个参数 OR {}， target = arguments[0] || {}, i = 1, length = arguments.length, deep = false; //这里的判断target是否为boolean,引申extend方法的另种形式 extend(boolean,dest,src1,src2,src3...)。 // Handle a deep copy situation if ( typeof target === "boolean" ) { deep = target; // skip the boolean and the target 看不懂么？越过第一个boolean把target设置为第二个参数，i++.