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  • What is your favourite cleverly written functional code?

    - by sdcvvc
    What are your favourite short, mind-blowing snippets in functional languages? My two favourite ones are (Haskell): powerset = filterM (const [True, False]) foldl f v xs = foldr (\x g a -> g (f a x)) id xs v -- from Hutton's tutorial (I tagged the question as Haskell, but examples in all languages - including non-FP ones - are welcome as long as they are in functional spirit.)

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  • Help, not able to decide iphone app Architecture

    - by iPhoneDev
    App is like this: Login View (with Navigation Bar - right button) Welcome View (With navigation Bar) Home Page- WITH TabBar and Navigation Bar Title Detail View - With Only Navigation Bar Screen will run from 1 to 4 and user can navigate between 3 and 4. I am confused which Architecture I will use: NavigationBased template OR TabBar based template. Please suggest.

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  • Rails render partial with block

    - by brad
    I'm trying to re-use an html component that i've written that provides panel styling. Something like: <div class="v-panel"> <div class="v-panel-tr"></div> <h3>Some Title</h3> <div class="v-panel-c"> .. content goes here </div> <div class="v-panel-b"><div class="v-panel-br"></div><div class="v-panel-bl"></div></div> </div> So I see that render takes a block. I figured then I could do something like this: # /shared/_panel.html.erb <div class="v-panel"> <div class="v-panel-tr"></div> <h3><%= title %></h3> <div class="v-panel-c"> <%= yield %> </div> <div class="v-panel-b"><div class="v-panel-br"></div><div class="v-panel-bl"></div></div> </div> And I want to do something like: #some html view <%= render :partial => '/shared/panel', :locals =>{:title => "Some Title"} do %> <p>Here is some content to be rendered inside the panel</p> <% end %> Unfortunately this doesn't work with this error: ActionView::TemplateError (/Users/bradrobertson/Repos/VeloUltralite/source/trunk/app/views/sessions/new.html.erb:1: , unexpected tRPAREN old_output_buffer = output_buffer;;@output_buffer = ''; __in_erb_template=true ; @output_buffer.concat(( render :partial => '/shared/panel', :locals => {:title => "Welcome"} do ).to_s) on line #1 of app/views/sessions/new.html.erb: 1: <%= render :partial => '/shared/panel', :locals => {:title => "Welcome"} do -%> ... So it doesn't like the = obviously with a block, but if I remove it, then it just doesn't output anything. Does anyone know how to do what I'm trying to achieve here? I'd like to re-use this panel html in many places on my site.

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  • pg.so problem with Ruby in Windows

    - by Alexander
    I have installed the pg module with help of gem install pg Which returned Successfully installed pg-0.8.0-x86-mswin32-60 When a .rb-file looks like this require 'rubygems' require 'pg' I get an LoadError (exception 126) which tells me that it can't find the module C:/Ruby/lib/ruby/gems/1.8/gems/pg-0.8.0-x86-mswin32-60/lib/pg.so. I heard something about that it is a Linux compilation. I'm really stuck so I really welcome suggestions. I have also installed PostgreSQL, I use Windows XP.

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  • mysql db image convert to file

    - by ntan
    Hi i am writing a converter from Oracle to mysql In Oracle the images are stored in db. I want to read the content of the image and save to file system I suppose that i have to read the blob entry and using php file commands create the file (am i right) What about image type. Should i save as jpg (what if the store image is not jpg) Any suggestion are welcome

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  • How to send a EML file as email using python script to list of emails one at a time?

    - by affan
    I want to write a simple python script that send a EML file exported from Outlook though given smtp server as email to a given list of emails. I know how to send a simple email but sending a EML file as email is not something i could do and could not find it on Google. Can anyone help me with that. The EML file is actually in HTML format with embedded images. Any alternate suggestion is also welcome.

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  • Getting shortest path between 2 nodes in quickgraph

    - by Xtapodi
    Hello, i want to ask if there is any way to generate the shortest path from node A to node B without generating the shortest paths to all the other nodes (stop when node B is in the examined set) with A-star in QuickGraph. I want to plug QuickGraph into a game and thus generating all the paths is not allowed from the time limitations the environment imposes. Any other suggestions to solve my problem in C# are welcome Thanks in advance, Xtapodi

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  • Google App Engine and SQL LIKE

    - by jb
    Is there any way to query GAE datastore with filter similar to SQL LIKE statement? For example, if a class has a string field, and I want to find all classes that have some specific keyword in that string, how can I do that? It looks like JDOQL's matches() don't work... Am I missing something? Any comments, links or code fragments are welcome

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  • Suggestions for a web hosting site (both PHP and ASP.NET)

    - by eibhrum
    Hi, I'm just wondering if there's a web hosting site that offers hosting for PHP and ASP.NET at the same time. It would be great if you give me a site that offers free service. I would like to use it for testing purposes only. But I could still look for affordable one. Comments/Suggestions are welcome. Thanks.

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  • Explaining abstraction to a non-programmer.

    - by Dominic Bou-Samra
    Abstraction is a concept that seems difficult to explain, without reverting to using programming terminology. I've thought about it a lot, and I can't come up with a satisfactory answer. Does anyone have any very general, yet very pertinent explanations? Metaphors, similes etc are all welcome.

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  • jdbc connection pooling

    - by llm
    Can anybody provide examples or links on how to establish a JDBC connection pool? From searching google I see many different ways of doing this and it is rather confusing. Ultimately I need the code to return a java.sql.Connection object, but I am having trouble getting started..any suggestions welcome.

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  • jQuery: columnizer plugin: is that slow ?

    - by Patrick
    hi, I'm using columnizer plugin (http://welcome.totheinter.net/columnizer-jquery-plugin/) to update my pages and display elements in vertical columns. It usually takes 2 seconds to update the view. Is that normal ? It seems to be quite slow. I sometimes receive Firefox message (Unresponsive javascript) thanks

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  • How To Format A Block of Code Within a Presentation?

    - by Noah Goodrich
    I am preparing a presentation using Google Docs Presentation though I can also work on the presenation within Open Office that will include code snippets. Is there any easy way to perform basic syntax highlighting on the code snippets with either Google Docs or Open Office Presenter? Edit: Since I believe that I can find a way to embed HTML any tools that can perform syntax highlighting on HTML would also be welcome suggestions.

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  • How to extract custom tokens in SQL Server NVarChar/VarChar field by using RegEx?

    - by Kthurein
    Is there any way to extract the matched strings by using Regex in T-SQL(SQL Server 2005)? For example: Welcome [CT Name="UserName" /], We hope that you will enjoy our services and your subscription will be expired on [CT Name="ExpiredDate" /]. I would like to extract the custom tokens in tabular format as follows: [CT Name="UserName" /] [CT Name="ExpiredDate" /] Thanks for your suggestion!

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  • How to handle major framework/dependency upgrades?

    - by APSampson
    Looking for some best practices on handling a major dependency upgrades within a project, assuming the use of a dependency management tool(e.g., Maven 2). Specifically, I'm interested in: How get an inherited application up-to-date(e.g., Spring 1.2.x to 2.5.x) What practices can be put into place to after such an overhaul to keep applications somewhat up-to-date Your own experiences or any articles/papers you've come across/found to be useful are welcome.

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  • Multithreaded Unit Testing

    - by scope-creep
    Hi, Can anybody recommend any good books on unit testing for multitesting applications. Also can any body recommend appplications or utilities which can be used for multithreaded testing, similar to the java tool ConTest, (which i've not used but a fried recommended) Any help particularly related to C# unit testing for multithreaded apps in particularly welcome. thanks. Bob.

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  • I can not add navigation item to navigation bar

    - by user262325
    Hello everyone I add a Navigation Bar to an view, I noticed that there is no left side arrow(Navigation Item). so I drag a Navigation Item from library to Navigation Bar, the green mark "+" displayed, but the Navigation Item was not added to the Navigation Bar actually. Welcome any comment Thanks interdev

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  • django: Changing auto_id of ModelForm based form class

    - by Meilo
    Every time I create an instance of the TestForm specified below, I have to overwrite the standard id format with auto_id=True. How can this be done once only in the form class instead? Any hints are very welcome. views.py from django.forms import ModelForm from models import Test class TestForm(ModelForm): class Meta: model = Test def test(request): form = TestForm(auto_id=True)

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  • Mathematica: get number of arguments passed to a function?

    - by dbjohn
    How do I get the number of arguments passed to a function, such as Plus[2,3,4,5] has 4 arguments passed to it. I was thinking it may involve the use of the function Length and getting the arguments into a list. The intention is to iterate an operation based on the number of arguments for a function. There is probably a simple solution or function but I haven't come across it yet. Any other ways or suggestions are welcome as well?

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