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  • when to use "willChangeValueForKey" and "didChangeValueForKey"?

    - by Frost Li
    I saw these lines in a demo project, but I couldn't understand why it did that. [self willChangeValueForKey:@"names"]; [self didChangeValueForKey:@"names"]; It called didChangeValueForKey immediately after willChangeeValueForKey. Does it make any sense? Furthermore, when should be the right time to call this two methods? Thanks a lot!! :)

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  • Usage of initialize() vs. setup() in Mootools

    - by RyOnLife
    Mootools classes have an initialize() method that's called when a new object is instantiated. It seems that setup() is a commonly used method as well. Most classes I've observed call this.setup() from initialize() and nowhere else, which has left me wondering: What's the purpose of setup()? Why not just put the setup() code in initialize()? When does it make sense to use a setup() method?

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  • How do I declare a constructor for an 'object' class type in Scala? I.e., a one time operation for the singleton.

    - by Zack
    I know that objects are treated pretty much like singletons in scala. However, I have been unable to find an elegant way to specify default behavior on initial instantiation. I can accomplish this by just putting code into the body of the object declaration but this seems overly hacky. Using an apply doesn't really work because it can be called multiple times and doesn't really make sense for this use case. Any ideas on how to do this?

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  • Save PHP variables to a text file

    - by Ajith
    I was wondering how to save PHP variables to a txt file and then retrieve them again. Example: There is an input box, after submitted the stuff that was written in the input box will be saved to a text file. Later on the results need to be brought back as a variable. So lets say the variable is $text I need that to be saved to a text file and be able to retrieve it back again. Hope it makes sense, Thanks in advance!!!

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  • What is the 'accumulator in HQ9+?

    - by Koning Baard XIV
    I was just reading a bit about the HQ9+ programming language ( http://esolangs.org/wiki/HQ9 , http://en.wikipedia.org/wiki/HQ9%2B and http://www.cliff.biffle.org/esoterica/hq9plus.html ), and it tells me something about a so called 'accumulator' which can be incremented, but not be accessed. Also, using the + doesn't manipulate the result: code H+H result Hello World Hello World Can anyone explain me how this works, what this does and if it even makes any sense? Thanks

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  • How to display HTML-like table data on iPhone?

    - by Jason
    I have a set of data in a matrix which I would like to display in my iPhone app with all of the rows and columns intact. Everything I can find on the web dealing with "tables iPhone" gives me information on UITableView, which only lets you show a list of items to the user - not an actual table in the HTML sense. What's the best way on the iPhone to display an actual table of data to the user, with column & row headings and table cells?

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  • When not to use a private field

    - by coffeeaddict
    When should it be considered dangerous to use a private field all over the place in the methods of your class? I mostly just create the variable and set it to a default value like null. Then in my methods reference it and set it to an instance of that object type from the methods. I don't know if my question makes sense but let me know if it doesn't and I'll clarify.

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  • Linking to a Large address aware DLL.

    - by Canopus
    Suppose I have a DLL which is built with LARGEADDRESSAWARE linker flag set. Now I have an application dynamically linking to this DLL. Does this make my application LARGEADDRESSAWARE? If not then, does it make sense to have this flag set for any DLL?

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  • How to: compare array with string and create hastags before tweeting

    - by krike
    Let's say I have the following array (which is the returned value of a database query): Array ( [0] => PHP [1] => Webdesign [2] => Wordpress [3] => Drupal [4]) And the following string: Working With Wordpress Shortcodes How can I compare the array with the string to see if the string contains any word stored in the array? (hopefully that made sense to you :d ) When he finds a match (eg: Wordpress) it should create a hashtag like so: Working With #Wordpress Shortcodes

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  • Session vs singleton pattern

    - by chobo
    Hi, I have a web application where I would like to pull user settings from a database and store them for Global access. Would it make more sense to store the data in a Singleton, or a Session object? What's the difference between the two? Is it better to store the data as an object reference or break it up into value type objects (ints and strings)? Thanks!

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  • Sql Server Development Server and Live

    - by Chris
    I have a database project that goes through iterations (only one so far) and I need to deploy a testing version to a live server. I'm not sure how to go about this. I can make all the changes in a copy and then remake those changes in the live version. That doesn't make sense. Is there a way to change a server name to an existing server? What's the best practice for this scenario?

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  • "Low level" project using Java

    - by Tammy Wilson
    I'm wondering if it would make sense to do some low level or OS stuff(a project) using Java. Reason why I ask is because I would like to expand my knowledge in Java and I'm into doing stuff like file compressor, bulk file renamer, etc. Are there any examples out there that I can look at or play with? Or should I just be using C or C++ instead? Thanks!

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  • What does "performant" software actually mean?

    - by Roddy
    I see it used a lot, but haven't seen a definition that makes complete sense. Wiktionary says "characterized by an adequate or excellent level of performance or efficiency", which isn't much help. Initially I though performant just meant "fast", but others seem to think it's also about stability, code quality, memory use/footprint, or some combination of all those. I think this is a "real" question - but if enough people reckon this is a subjective question, that's an answer in itself.

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  • fire jquery .animate oninput only once

    - by luke
    http://jsfiddle.net/nFFuD/ I'm trying to animate the search field in this example using jquery, making it move to the top of it's containing div oninput. I was originally using scriptaculous effect.move to do this, but I couldn't make the event only fire once, so if someone kept typing after the first keystroke, the effect would stop and start again from it's current position in the animation for each additional keystroke, which is stupid. I'm new to new to using jquery so please, take it easy if I'm not making very much sense.

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  • Why not use HTTPS for everything?

    - by Malfist
    If I was setting up a server, and had the SSL certificate(s), why wouldn't I use HTTPS for the entire site instead of just for purchases/logins? I would think it would make more sense just to encrypt the entire site, and protect the user entirely. It would prevent problems such as deciding what has to be secured because everything would be, and it's not really an inconvenience to the user. If I was already using an HTTPS for part of the site, why wouldn't I want to use it for the entire site?

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  • Increment an index that uses numbers and characters

    - by Martin
    I have a string based code that can be either two or three characters in length and I am looking for some help in creating a function that will increment it. Each 'digit' of the code has a value of 0 to 9 and A to Z. some examples: the first code in the sequence is 000 009 - next code is - 00A 00D - next code is - 00E AAZ - next code is - AB0 the last code is ZZZ. Hope this makes some sense.

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  • MacPorts / Terminal: `Unrecognized action "sudo"`

    - by Chris
    I'm trying to install Image Magick on MAMP. And I'm seriously out of my depth. I've installed MacPorts, and opened the terminal. I've typed in sudo port -v selfupdate per the instructions on http://www.macports.org/install.php#pkg But the response I get from the Terminal is Unrecognized action "sudo" I've googled and googled, but can't find anything that makes a slab of sense. Any clever people feeling generous?

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  • Erlang: How do you reload an application env configuration?

    - by mwt
    How do you reload an application's configuration? Or, what are good strategies for managing dynamic application configuration? For example, let's say I had log levels and I wanted to change them at runtime. Also, let's assume this is one of many such options. Does it make sense to have a "configuration server" that holds configuration state for other parts of the application to query? Do people do that or did I just make it up?

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  • Metaprogramming on web server

    - by bobobobo
    From time to time, I find myself writing server code that produces JavaScript code as the output result. I can point out why it is really bad: Inextricable tie between server code and client code. Can render client code un-reusable. But sometimes, it just seems to make sense. And isn't it kinda sorta interesting? I guess the question is, is writing server code that produces JavaScript code a really bad practice, or "does everyone do it"?

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