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  • Abstract over X

    - by Bruno Bieth
    Sorry for this english related question but I only came across that expression in the context of IT. What does abstracting over something mean ? For example abstracting over objects or abstracting over classes. Thanks

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  • Function of: if(/(file|http).*/.test(url)) { }

    - by WmasterJ
    I am wondering what this technique is called and what it does. It seems to be validating some regular expression on the variable url. I am customizing another persons code: var url = document.getElementById("editorURL").value; if(/(file|http).*/.test(url)) { } Maybe someone has a link to an article that explains this a bit more in-depth?

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  • Linq List contains specific values.

    - by Raffaeu
    I need to know if the List I am working with contains only some specific values. var list = new List<string> { "First", "Second", "Third" }; If I want to know if the List contain at least one item with the value "First" I use the Any keyword: var result = list.Any(l => l == "First"); But how I can write a Linq expression that will return true/false only if the List contains "First" and "Second" values?

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  • passing Func<TSource, TKey> keySelector error

    - by user338429
    static void Main() { string[] a = { "a", "asd", "bdfsd", "we" }; a = a.OrderBy(fun).ToArray(); } private static int fun(string s) { return s.Length; } its is giving compile time error . I know that we can do this with Lambda expression like this. a.OrderBy(s=>s.Length).ToArray(); but i want to this do by defining different function . What mistake i have done?

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  • check that int array contains !=0 value using lambda

    - by netmajor
    hey, I have two-dimension array List<List<int>> boardArray How can I enumerate throw this array to check that it contains other value than 0 ? I think about boardArray.Contains and ForEach ,cause it return bool value but I don't have too much experience with lambda expression :/ Please help :)

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  • Converting upper-case string into title-case using Ruby

    - by wsb3383
    Hi, all. I'm trying to convert an all-uppercase string in Ruby into a lower case one, but with each word's first character being upper case. Example: convert "MY STRING HERE" to "My String Here". I know I can use the .downcase method, but that would make everything lower case ("my string here"). I'm scanning all lines in a file and doing this change, so is there a regular expression I can use through ruby to achieve this? Thanks!

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  • Why is T() = T() allowed in C++?

    - by Rimo
    I believe the expression T() creates an rvalue (by the Standard) However the following code compiles (at least on gcc4.0) class T {... }; int main() { T() = T(); } I know technically this is possible because member functions can be invoked on temporaries and the above is just invoking the operator= on the r-value temporary created from T(). But conceptually this is like assigning a new value to an r-value. Is there a good reason why this is allowed?

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  • Haskell Tuple Size Limit

    - by SHiNKiROU
    Why I can't construct large tuples in Haskell? Why there's a tuple size limit? Prelude> (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1) <interactive>:1:0: No instance for (Show (t, t1, t2, ... t23)) arising from a use of `print' at <interactive>:1:0-48 Possible fix: add an instance declaration for (Show (t, t1, t2, ... t23)) In a stmt of a 'do' expression: print it

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  • Validate format of email in rails.

    - by piemesons
    validates_format_of :email, :with => /^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" + @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" + @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)/, :message => "is missing or invalid" Please let me know where is the problem? Is regular expression is wrong?

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  • Need some help with a NHibernate Query

    - by cwap
    Hi all Say I got 3 entities: Business, Employee and Payment. A payment has a foreign key to an Employee, while the Employee has an foreign key to a business. Now, I want to create a query which gives me all payments for a given business. I really don't have a clue about how to do this - I guess I want something like: mySession.CreateCriteria<Payment>() .Add(Criterion.Expression.Eq(/* Employee_FK => Employee.Business_FK == BusinessID */); Any help would be greatly appreciated :)

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  • OrderBy on children in a LINQ Query

    - by eka808
    Hello everybody I have a user entity who contains a one to many relationship with a role entity So with this linq expression : from user in USER_TABLE.Include("USERROLE_TABLE") order by user.Name select user I can get users with related roles as a child. My problem is that i want to get roles of each user ordered alphabetically. How can i do that ? I googled a lot and don't find anything Thank's by advance !

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  • Custom Control in Silverlight ListBox

    - by jaime
    I have a custom control I created from a expression design I created and exported to xaml. I have put in it a bound itemtemplate/datatemplate of a ListBox contorl. It doesn't seem to be rendering more than once and/or it is rendering each item in the same place(kind of like the same x,y coordinates.

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  • C++ WCHAR: Cannot allocate an array of constant size 0

    - by Rosarch
    I'm trying to create a WCHAR: LONG bufferSize = foo.bar() + 1; WCHAR wszBaz[bufferSize]; The compiler issues an error: error C2057: expected constant expression error C2466: cannot allocate an array of constant size 0 error C2133: 'wszBaz' unknown size What am I doing wrong? UPDATE: I added const but it still gives the same error: const LONG bufferSize = foo.bar() + 1; WCHAR wszBaz[bufferSize];

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  • jQuery Treemap Plugin

    - by Revert
    Hello, I am trying to get the Treemap plugin (http://www.jquery.info/spip.php?article40) working with jQuery v1.3.x. The plugin works with jQuery v1.1 and v1.2 but for some reason it fails with the v1.3 base. This is the browser error "Error: uncaught exception: Syntax error, unrecognized expression: " Does anyone know changes occurred between JQuery v1.2 and v1.3 that could cause this? Cheers, D

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  • Selecting text between Brackets in an input field with Jquery

    - by Marcel
    Hi, with $("#TextInputElement").select() I am able to select a text (mark it) in an in an input text field. Now I only want to select the text in between brackets in that input field. I have the regular expression match(/-[^-]*-/) to select, but how would I apply this to only select the text inside the input field between brackets? [noselect]textToBeSelected[/noselect] thx

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  • Find multiple line spanning text and replace using Powershell

    - by MrGrant
    Hello, I am using a regular expression search to match up and replace some text. The text can span multiple lines (may or may not have line breaks). Currently I have this: $regex = "\<\?php eval.*?\>" Get-ChildItem -exclude *.bak | Where-Object {$_.Attributes -ne "Directory"} |ForEach-Object { $text = [string]::Join("`n", (Get-Content $_)) $text -replace $RegEx ,"REPLACED"}

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  • Translate LINQ to sql statement

    - by zielu1
    Hi, I want to translate LINQ expression tree to SQL statement and I don't want to write my own code for this. Example: var query = from c in Customers where c.Country == "UK" && c.City == "London" select c); To SELECT ... FROM Customers AS c WHERE c.Country = "UK" AND c.City = "London" I know DataContext.Log, but I want to use: query.ToSqlStatementString() Thanks

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  • Haskell Input & Passing Values to Functions

    - by Pradeep
    putStrLn "Enter the Artist Name" art <- getLine putStrLn "Enter the Number of CD's" num <- getLine let test= buyItem currentStockBase art num printListIO (showcurrentList test) the values i have to pass for buyItem is buyItem currentStockBase "Akon" 20 but i want to send "Akon" to art and for 20 i want to send num it gives me this error ERROR file:.\Project2.hs:126 - Type error in application *** Expression : buyItem currentStockBase art num *** Term : num *** Type : [Char] *** Does not match : Int please help me

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  • Validate a string

    - by Activist
    I'm not that good with regular expressions... I need a JavaScript regular expression that will do the following: The string can contain letters (upper and lower case), but not punctuations such as éàïç... The string can contain numbers (0..9) anywhere in the string, except on the first position. The string can contain underscores (_). Valid strings: foo foo1 foo_bar fooBar Invalid strings: 1foo -- number as first character foo bar -- space föo -- punctuation ö Many thanks!

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