Note that you don’t have to use property as a decorator. You can quite happily use it the old way and expose the individual methods in addition to the property: class A: def get_x(self, neg=False): return -5 if neg else 5 x = property(get_x) >>> a = A() >>> a.x 5 >>> a.get_x() 5 >>> … Read more
Let’s improve stacker’s example and use Scala’s case classes: case class Person(firstName: String, lastName: String) The above Scala class contains all features of the below Java class, and some more – for example it supports pattern matching (which Java doesn’t have). Scala 2.8 adds named and default arguments, which are used to generate a copy … Read more
Firefox’s native developer tools have come a long way since this question was written. The differences have mainly reduced to the following points: Can’t stop the script execution on DOM mutations, XHRs, or cookie changes. XPaths can’t be copied. Missing an events side panel in the Inspector (though events are displayed within the DOM structure). … Read more
They originated in C in the header <iso646.h>. At the time there were keyboards that couldn’t type the required symbols for && (for example), so the header contained #define‘s that would assist them in doing so, by (in our example) defining and to be &&. Of course, as time went by this became less used. … Read more
Using a protocol-independent absolute path: <img src=”//domain.example/img/logo.png”/> If the browser is viewing an page in SSL through HTTPS, then it’ll request that asset with the HTTPS protocol, otherwise it’ll request it with HTTP. This prevents that awful “This Page Contains Both Secure and Non-Secure Items” error message in IE, keeping all your asset requests within … Read more
Quoted from http://www.geekinterview.com/question_details/64739: Advantages of inner class: Logical grouping of classes: If a class is useful to only one other class then it is logical to embed it in that class and keep the two together. Nesting such “helper classes” makes their package more streamlined. Increased encapsulation: Consider two top-level classes A and B where … Read more
GO is like the end of a script. You could have multiple CREATE TABLE statements, separated by GO. It’s a way of isolating one part of the script from another, but submitting it all in one block. BEGIN and END are just like { and } in C/++/#, Java, etc. They bound a logical block … Read more
The question isn’t really “why is there a null value in JS” – there is a null value of some sort in most languages and it is generally considered very useful. The question is, “why is there an undefined value in JS”. Major places where it is used: when you declare var x; but don’t … Read more
There is no shorthand for Visual Studio 2008 or prior for VB.NET. In Visual Studio 2010 and beyond, you can use the following shorthand: Public Property FirstName as String This will be handled as your short version in C# is – I think they call it “Auto Property” See also: Auto-Implemented Properties (Visual Basic)
Python has such an operator: variable = something if condition else something_else Alternatively, although not recommended (see karadoc’s comment): variable = (condition and something) or something_else