Fun with Lambdas

Posted by Roman A. Taycher on Stack Overflow See other posts from Stack Overflow or by Roman A. Taycher
Published on 2010-02-18T22:12:38Z Indexed on 2010/04/25 4:13 UTC
Read the original article Hit count: 328

Filed under:

lambda

|

blocks

|

closures

|

examples

|

functions

Not having them used them all that much I'm not quite sure all that lambdas/blocks can be used for (other than map/collect/do/lightweight local function syntax). If some people could post some interesting but somewhat understandable examples (with explanation).

preferred languages for examples: python, smalltalk, haskell

© Stack Overflow or respective owner

Related posts about lambda

InvalidOperationException (Lambda parameter not in scope) when trying to Compile a Lambda Expression

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I'm writing an Expression Parser to make my API more refactor friendly and less error prone. basicaly, I want the user to write code like that: repository.Get(entity => entity.Id == 10); instead of: repository.Get<Entity>("Id", 10); Extracting the member name from the left side… >>> More
Lambda returning another lambda

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, is there any way how to return lambda from another lambda recursively? All I want to do is finite state machine, implemented as lambda, which returns lambda implementing another state (or null). nesting Func< won't work as I want. C#, .NET 3.5 >>> More
Query on Booleans in Lambda Calculus

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, I have following query on lambda calculus which am not able to understand: Here is the lambda calculus representation for the AND operator: lambda(m).lambda(n).lambda (a).lambda (b). m(n a b) b Can anyone help me in understanding this representation? Regards, darkie >>> More
How does C# lambda work?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to implement method Find that searches the database. I want it to be like that: var user = User.Find(a => a.LastName == "Brown"); Like it's done in List class. But when I go to List's source code (thanks, Reflector), I see this: public T Find(Predicate<T> match) { if (match… >>> More
Query on Booleans in Lambda Calculus

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, I have following query on lambda calculus which am not able to understand: Here is the lambda calculus representation for the AND operator: lambda(m).lambda(n).lambda (a).lambda (b). m(n a b) b Can anyone help me in understanding this representation? Regards, darkie >>> More

Related posts about blocks

What is the quickest way to indent a block of text with spaces for use within a web browser?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I occasionally have the need to indent a block of text with spaces for use within a web browser, for example, when formatting a code block on this site or in a post on Launchpad. So far I've just done it by hand by copying four spaces to the clipboard and then mashing keys really fast: ?, Home,… >>> More
Codeblocks gui problems [closed]

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I'm having problems with Code::Blocks 10.05 my os specs: Ubuntu 11.04 - fresh install gtk theme: Ambiance Unity The actual problem (don't mind the code nor the errors) the most visible one - stripes As I scroll down the code, the horizontal stripes start to show up. I think it's some problem… >>> More
What is a quick way to indent a block of text with spaces for use within a web browser?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I occasionally have the need to indent a block of text with spaces for use within a web browser, for example, when formatting a code block on this site or in a post on Launchpad. So far I've just done it by hand by copying four spaces to the clipboard and then mashing keys really fast: ?, Home,… >>> More
unable to save files from Code Blocks ONLY

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
i have an NTFS drive mounted in a folder /Tejas i have created a new project using it in a folder in this drive but i am unable to save the changes, i get the following error message Couldn't save project /Tejas/Project/codeblock/ciphers/ciphers.cbp (Maybe the file is write-protected?) i… >>> More
Can somebody help me setting up wxWidgets 3.0 for codeblocks12.11 on ubuntu 12.04?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I already downloaded and installed codeblocks 12.11svn9156. After that, I downloaded and compiled wxWidgets3.0 using make. When I go to codeblocks I don't see wxWidgets3.0 in the wxWidget project wizard. Also, the wizard prompts me "wxSmith plugin is not loaded, can not continue" I know some additional… >>> More