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  • Rubyists: What is this called?

    - by Matt Darby
    Say I have a pool of enumerables that I want to group by an attribute: cars = Car.all.group_by(&:color) Then I want to iterate over those cars like so: cars.inject([]) do |stack, (color, cars)| stack << cars.each do |car| ... end end What is the term for the block variable extension (between the parentheses)?

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  • How would you implement the "tell don't ask" principle in HAML?

    - by Enrique Ramírez Vélez
    Here's the thing. I have a button that, depending on the scenario, will behave, look and have different text. Here's how it, roughly, looks like at the moment: - if params[:param_A] && @statement_A %span.button.cancel_button{attribute: "value_B"} - if @statement_B = t('locale_A') - else = t('locale_B') - elsif params[:param_A] %span.button.cancel_button{attribute: "value_A"} - if @statement_B = t('locale_A') - else = t('locale_B') There's also a CSS class both buttons should have IF statement_B is true. So it is a mess. And I recently read about the "Tell, don't ask" principle which I liked very much, so I'd love to apply it here... but I'm not sure how. I know I could make a helper, but I'd like to stay away from them because reasons (I really have some valid reasons to do so, but those are beyond the scope of this question). I can resort to that as a last resource, but would rather find another solution.

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  • Merging some sorted lists with unknown order sequence

    - by Gabriel
    I've some sorted lists with variable number of elements. I wold like to merge the lists into one big list which contains all other lists in same order, without duplicates. Example: 1. XS,M,L,XL 2. S,M,XXL 3. XXS,XS,S,L Result: XXS,XS,S,M,L,XL,XXL The function should notify, if there are elements which have ambiguous positions. Here, it would be XXL and I need to specify its position after XL.

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  • numeric cycles in shell

    - by oraz
    hello, what is the name and sintacsys of construcion ((..)) in example below? for ((i=1;i<10;i++)) do echo $i; done it has strange variable i where are other constructons for numeric cycling in shell?

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  • Please help me:(

    - by Marin
    Hi! Can anyone please help me?:( I'm desperrate cause I have to finish this script as soon as possible! The problem is: Deprecated: Assigning the return value of new by reference is deprecated in C:\wamp\www\FlashChat_v607\chat\inc\common.php on line 155 Notice: Undefined variable: step in C:\wamp\www\FlashChat_v607\chat\inc\common.php on line 94 and this is the link where you can find the code: http://www5.zippyshare.com/v/3592861/file.html

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  • Reading from a oracle temp table in a separate procedure than the one it was populted in

    - by Bob
    I have a 2 stored procedures, the first creates an oracle temp table and the second reads from it. The temp table only has scope for that session. I'm calling the procedures from .Net and the second procedure never returns any results. However if I use the same sprocs and parameters in SQL*Plus it works fine. I've tried creating an Oracle Transaction object and had hoped I'd be able to read the tables in while still using the same transaction - trying to emulate an SQL Plus type of single connection environment. Any ideas what I'm doing wrong??

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  • How can I specify a different configuration for Vim based on the executable name?

    - by Jacobo de Vera
    I am trying to open Vim with different configuration options depending on the executable file name. I intend to create a number of symbolic links to vim and I'd like to do something like this in my .vimrc if execname == "vim2" " configuration here endif Is there a variable in Vim that holds the name of the executable file being run? Alternatively, is there another way I can have different configurations without having to keep more than one .vimrc file?

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  • Shopping Cart in Flex 4

    - by chchrist
    I am trying to code a shopping cart using Flex 4. I am at the design process and I need to figure out which design pattern to use. I am thinking of using the Singleton pattern. I will have a Product Value Object where I'll save each product's values and the I'll push each product to an array variable in my Singleton class. Is my logic OK? Is there a better way? Thanks in advance

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  • NSMutableArray with only a particular type of objects

    - by Leo
    Hello, is it possible to specify that a NSMutableArray can only contain a certain type of objects. For example, if I want to store only this kind of objects : @interface MyObject : NSObject { UInt8 value; } In order to be able to use the instance variable like this : - (void)myMethod:(NSMutableArray *)myArray{ for (id myObject in myArray){ [self otherMethod:myObject.value]; } } because I'm getting this error : request for member 'value' in something not a structure or union Thank you for your help

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  • How to learn to estimate how long assigments will take?

    - by SDGator
    This might be out of scope for this website. If it is, let me know and I'll remove the question. After 15 years in the industry, I still suck at answering the question "How long do you think X will take?" For scheduling purposes, we always have to give an estimate of how long different sub-tasks in a project will take. What's the best way to get better at estimating how long it will take to do something? Some people are really good at this. Are there any books, techniques or whatever that people use to get better at this?

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  • C: Random Number Generation - What (If Anything) Is Wrong With This

    - by raoulcousins
    For a simple simulation in C, I need to generate exponential random variables. I remember reading somewhere (but I can't find it now, and I don't remember why) that using the rand() function to generate random integers in a fixed range would generate non-uniformly distributed integers. Because of this, I'm wondering if this code might have a similar problem: //generate u ~ U[0,1] u = ( (double)rand() / ((double)(RAND_MAX)); //inverse of exponential CDF to get exponential random variable expon = -log(1-u) * mean; Thank you!

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  • JSTL Session Lookup - Key Has Periods

    - by John W.
    Hello All, I am working with some legacy code, and at some point there is a key in the session that is something like session.setAttribute("com.org.something.Object",someObject); Now trying to access this in a jsp using jstl is a bit difficult becuase if I tried it like I normally would I would do: ${sessionScope.com.org.something.Object.someFieldGetter} As most of us can imagine it will fail because there is no com object in session scope. I also tried ${sessionScope.'com.org.something.Object'.someFieldGetter} And a parsing error was thrown. Does anyone know how to resolve this so that I can correctly get the object similar to session.getAttribute("com.org.something.Object") but through jstl? thank you.

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  • $stdin compatibility with std::istream using swig, C++, and Ruby

    - by Kenny Peng
    I have a function in C++ that takes in an std::istream as the input: class Foo { Foo(std::istream &); } Using SWIG, I've bound it to Ruby, but Ruby's $stdin variable is fundamentally different from anything like the stream classes in C++, so I'm not sure how to either 1) expose the C++ class to Ruby in a way that I can use $stdin, or 2) convert $stdin into something the C++ class can understand. Anyone have experience with binding iostreams in C++ to Ruby? Thanks.

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  • Python float copy question

    - by SJA
    Hi, I'm puzzled by some behaviour I'm seeing when copying a float array member into another variable - please help! For example data_entry[1] = 9.6850069951 new_value = data_entry[1] <comment> #print both 9.6850069951 9.6850663300 I'm aware of the problem of binary storage of floats but I thought with a direct copy of memory we would end up with the same value. Any ideas? I need better precision than this! thanks in advance Stuart

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  • .htaccess | Adding A Second Vanity URL

    - by Necro.
    I want to take my .htaccess file and add a second rule for another vanity URL as I already have one declaring the page. So how would I write it so I can go to my page, and the next vanity being a variable for a profile? Ex:// mywebsite.com/page/profile Here is my current .htaccess file. RewriteEngine On RewriteBase / RewriteRule ^([a-zA-Z0-9-]+)$ index.php?p=$1 [L] RewriteRule ^([a-zA-Z0-9-]+)/$ index.php?p=$1 [L]

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  • python / sets / dictionary / initialization

    - by Mario D
    Can someone explain help me understand how the this bit of code works? Particularly how the myHeap assignment works. I know the freq variable is assigned as a dictionary. But what about my myHeap? is it a Set? exe_Data = { 'e' : 0.124167, 't' : 0.0969225, 'a' : 0.0820011, 'i' : 0.0768052, } freq = exe_Data) myHeap = [[pct, [symbol, ""]] for symbol, pct in freq.items()]

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  • Hide html horizontal but not vertical scrollbar

    - by williamjones
    I have an html textarea that is of fixed width, but variable height. I would like to set overflow:scroll and be able to show a vertical scrollbar, but not a horizontal one. I am not able to use overflow:auto due to other things specific to my situation. I know there is no way using CSS 2 to show only vertical but not horizontal scrollbars. Is there anything I can do with javascript to hide the horizontal scrollbar?

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  • Efective way to avoid integer overflow when multiplying?

    - by Jonathan
    Hi, I'm working on a hash function which gets a string as input. Right now I'm doing a loop and inside the hash (an int variable) is being multiplied by a value and then the ASCII code for the current character is added to the mix. hash = hash * seed + string[i] But sometimes, if the string is big enough there is an integer overflow there, what can I do to avoid it while maintaining the same hash structure? Maybe a bit operation included inside the loop?

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  • Heap corruption detected error when attempting to free pointer

    - by AndyGeek
    Hi, I'm pretty new to C++ and have run into a problem which I have not been able to solve. I'm trying to convert a System::String to a wchar_t pointer that I can keep for longer than the scope of the function. Once I'm finished with it, I want to clean it up properly. Here is my code: static wchar_t* g_msg; int TestConvert() { pin_ptr<const wchar_t> wchptr = PtrToStringChars("Test"); g_msg = (wchar_t*)realloc(g_msg, wcslen(wchptr) + 1); wcscpy(g_msg, wchptr); free (g_msg); // Will be called from a different method } When the free is called, I'm getting "HEAP CORRUPTION DETECTED: after Normal block (#137) at 0x02198F90." Why would I be getting this error? Andrew L

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  • Invalid syntax in this simple Python application.

    - by Sergio Boombastic
    Getting an invalid syntax when creating the template_value variable: class MainPage(webapp.RequestHandler): def get(self): blogPosts_query = BlogPost.all().order('-postDate') blogPosts = blogPosts_query.fetch(10) if users.get_current_user(): url = users.create_logout_url(self.request.uri) url_linktext = 'Logout' else: url = url = users.create_login_url(self.request.uri) url_linktext = 'Login' template_value = ( 'blogPosts': blogPosts, 'url': url, 'url_linktext': url_linktext, ) path = os.path.join(os.path.dirname(__file__), 'index.html') self.response.out.write(template.render(path, template_values)) The error fires specifically on the 'blogPosts': blogPosts line. What am I doing wrong? Thanks!

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