In PHP 5.4+, the parser’s been modified so you can do something like this (new Foo())->xyz(); Wrap the instantiation in parenthesis, and chain away. Prior to PHP 5.4, when you’re using the new Classname(); syntax, you can’t chain a method call off the instantiation. It’s a limitation of PHP 5.3’s syntax. Once an object is …
Change your code to this and I think it’ll explain things (presumably super is looking at where, say, B is in the __mro__?): class A(object): def __init__(self): print “A init” print self.__class__.__mro__ class B(A): def __init__(self): print “B init” print self.__class__.__mro__ super(B, self).__init__() class C(A): def __init__(self): print “C init” print self.__class__.__mro__ super(C, self).__init__() class …
I personally find that using constructors is a much more common practice than knowing to use newInstance() and passing parameters. The factory method pattern is used fairly frequently in modern software development. So basically my question is, why does Google not want you to use constructors with parameters for Fragments? You answered your own question: …
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 …
I needed a solution for this because my code was calling the new operator. I wanted to mock the object that the new call created. var MockExample = sinon.stub(); MockExample.prototype.test = sinon.stub().returns(“42”); var example = new MockExample(); console.log(“example: ” + example.test()); // outputs 42 Then I used rewire to inject it into the code that …
Great question. What you are probing is how Java initializes objects – and there are a number of steps involved. i know is constructor is also a method (Maybe i am wrong). Nearly right. The Constructor is a special method. If you decompile a class file, you’ll see the constructors get renamed to <init>. <init> …
In C++, initializer lists are necessary because of a few language features that are either not present in Java or work differently in Java: const: In C++, you can define a fields that are marked const that cannot be assigned to and must be initialized in the initializer list. Java does have final fields, but …
You should use the constructor approach, when you want to create a new instance of the object, with the values already populated(a ready to use object with value populated). This way you need not explicitly call the setter methods for each field in the object to populate them. You set the value using a setter …
There is a basic difference, which in short can be described as “the difference between the project of a house and the house itself”. For expert programmers I would just say that “new Backbone.Model” returns an object instance, but “Backbone.Model.extend” returns a constructor function FIRST: a new object (i.e. The house) var TestModel = new …
If you want to alter the attributes dict before the class is created, or change the bases tuple, you have to use __new__. By the time __init__ sees the arguments, the class object already exists. Also, you have to use __new__ if you want to return something other than a newly created class of the …