Rosetta Stone: Observer Pattern

Posted by Shiftbit on Stack Overflow See other posts from Stack Overflow or by Shiftbit
Published on 2010-03-20T15:43:39Z Indexed on 2010/03/20 15:51 UTC
Read the original article Hit count: 650

Filed under:

rosetta-stone

|

observer

How is the Observer Pattern expressed in various programming languages? Can you provide a code snippet that illustrates the major differences in each language. This post is intended to demonstrate the differences of this commonly used design pattern.

I will start this off with a Java example. Remember to start your answer off with the language being demonstrated.

© Stack Overflow or respective owner

Related posts about rosetta-stone

Rosetta Stone Network V3 doesn't recognize built-in microphone in OSX Lion

as seen on Super User - Search for 'Super User'
I am using Rosetta Stone Network V3 on an early 2011 MacBook Pro running OSX Lion 10.7.3. When I log in, select a language and level, and then a lesson, I am prompted to select a microphone. The built in microphone doesn't show up, yet I've used it multiple times for other applications. I heard from… >>> More
Rosetta Stone: Observer Pattern

as seen on Stack Overflow - Search for 'Stack Overflow'
How is the Observer Pattern expressed in various programming languages? Can you provide a code snippet that illustrates the major differences in each language. This post is intended to demonstrate the differences of this commonly used design pattern. I will start this off with a Java example. Remember… >>> More
Rosetta Stone: Great example projects

as seen on Stack Overflow - Search for 'Stack Overflow'
In your opinion, what is a great example application which demonstrates the best techniques for its language and problem domain, and could be used as a reference for other programmers? Please provide answers where the source is readily available for viewing (i.e. open-source projects), and provide… >>> More
Rosetta Stone data on Dropbox

as seen on Super User - Search for 'Super User'
Hi, I'm currently trying to learn a new language using Rosetta Stone. Given that I have 2 computers (mac desktop and laptop), I was wondering if anyone knew if it was possible to have the data files in Dropbox so that I can synchronize my learning across computers. >>> More
How to fix error 1330 (invalid digital signature) when installing "The Rosetta Stone"

as seen on Super User - Search for 'Super User'
I bought an older version of this software from a friend and the Rosetta Stone support hasn't been of much use. When installing, at the end of the process I get an error from the installer that says something along the lines of: Error 1330. A file that is required cannot be installed because the… >>> More

Related posts about observer

Adding an observer to UIImageView? observer & notifications

as seen on Stack Overflow - Search for 'Stack Overflow'
Each class has almost one method named addObserver [imgVURL addObserver:<#(NSObject *)observer#> forKeyPath:<#(NSString *)keyPath#> options:<#(NSKeyValueObservingOptions)options#> context:<#(void *)context#>] Here, imgVURL is an image which is going to be load an image asynchronously… >>> More
iPhone Key-Value Observer: observer not registering in UITableViewController

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi Fellow iPhone Developers, I am an experienced software engineer but new to the iPhone platform. I have successfully implemented sub-classed view controllers and can push and pop parent/child views on the view controller stack. However, I have struck trouble while trying to update a view controller… >>> More
'click' observer in Prototype

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a page which contains several divs (each with a unique ID and the same class, 'parent'). Underneath each "parent" div, is a div with class "child" and unique ID name -child. This DIV is upon page load empty. Whenever you click on a parent DIV, the following code is executed. $$('div.parent')… >>> More
A talk about observer pattern

as seen on Programmers - Search for 'Programmers'
As part of a university course I'm taking, I have to hold a 10 minute talk about the observer pattern. So far these are my points: What is it? (defenition) Polling is an alternative Polling VS Observer When Observer is better When Polling is better (taken from here) A statement that Mediator pattern… >>> More
Is there a design pattern for chained observers?

as seen on Programmers - Search for 'Programmers'
Several times, I've found myself in a situation where I want to add functionality to an existing Observer-Observable relationship. For example, let's say I have an Observable class called PriceFeed, instances of which are created by a variety of PriceSources. Observers on this are notified whenever… >>> More