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• Ur/Web new purely functional language for web programming?

  - by Phuc Nguyen

  I came across the Ur/Web project during my search for web frameworks for Haskell-like languages. It looks like a very interesting project done by one person. Basically, it is a domain-specific purely functional language for web programming, taking the best of ML and Haskell. The syntax is ML, but there are type classes and monad from Haskell, and it's strictly evaluated. Server-side is compiled to native code, client to Javascript. See the slides and FAQ page for other advertised advantages. Looking at the demos and their source code, I think the project is very promising. The latest version is something 20110123, so it seems to be under active development at this time. My question: Has anybody here had any further experience with it? Are there problems/annoyances compared to Haskell, apart from ML's slightly more verbose syntax? Even if it's not well known yet, I hope more people will know of it. OMG this looks very cool to me. I don't want this project to die!!

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• What is your unique programming problem-solving style? [closed]

  - by gcc

  Everyone has their own styles and technique for approaching and solving real world problems. These distinguish us from other people or other programmers. (Actually, I think it make us more desirable as programmers and improves computer science) To improve, we read a lot of books; for example, programming style, how to solve problems, how to approach problems, software and algorithms, et al. Can I learn your technique? In other words, if someone gives you a problem, at first step, what are you doing to solve it? I want learn the style in which you approach, analyze, and solve a problem. EDIT: every programmer is a unique instance; each of us approach problems and converge on solutions in our own... idiomatic manner. This manner is sometimes a quirk of training, a bias of tools, but often it is an insightful nugget, a little golden hammer that cracks nuts just slightly faster then others. When answering, give your general approaches but also take a moment to identify how you look at things in ways that your peers do not. Let's call this your Unique Solving Perspective, or USP.

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• What are the factors affecting a new programming language?

  - by Saurav Sengupta

  I am developing a new general-purpose programming language of my own design. It's currently my own personal project. I have read of some experts saying that new languages do not usually survive (unfortunately I can't find a reference to that right now). What are the most substantial problems that a new language faces? The language syntax is similar to C/Python families, it does not use S-expressions, and it is an imperative language, but I'm doing first-class functions in it to provide the facilities of currying. In particular, I am concentrating on translating the source language to an intermediate language for execution by an interpreter, but I'm not in a position to translate to native code yet. What would be the issues with that? I've not personally used many non-native code languages, so I'm not well aware of the performance issues on today's machines. I also can't decide upon a lexer and parser generator. What would be the pros and cons of Flex and Yacc vs. hand-made? And what benefits will LLVM provide? I need to get the interpreter ready as quickly as possible. Finally, what factors will affect the language's use post release? I am planning a small library of essentials and full documentation for the first phase.

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• Programming habits, patterns, and standards that have developed out of appeal to tradition/by mistake? [closed]

  - by user828584

  Being self-taught, the vast majority of what I know about programming has come from reading other peoples' code on websites like this. I'm starting to wonder if I've developed bad or otherwise pointless habits from other people, or even just made invalid assumptions. For example, in javascript, void 0 is used in a lot of places, and until I saw this, I just assumed it was necessary and that 0 had some significance. Also, the http header, referer is misspelled but hasn't been changed because it would break a lot of applications. Also mentioned in Code Complete 2: The architecture should describe the motivations for all major decisions. Be wary of “we’ve always done it that way” justifications. One story goes that Beth wanted to cook a pot roast according to an award-winning pot roast recipe handed down in her husband’s family. Her husband, Abdul, said that his mother had taught him to sprinkle it with salt and pepper, cut both ends off, put it in the pan, cover it, and cook it. Beth asked, “Why do you cut both ends off?” Abdul said, “I don’t know. I’ve always done it that way. Let me ask my mother.” He called her, and she said, “I don’t know. I’ve always done it that way. Let me ask your grandmother.” She called his grandmother, who said, “I don’t know why you do it that way. I did it that way because it was too big to fit in my pan.” What are some other examples of this?

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• How are objects modelled in a functional programming language?

  - by Giorgio

  In an answer to this question (written by Pete) there are some considerations about OOP versus FP. In particular, it is suggested that FP languages are not very suitable for modelling (persistent) objects that have an identity and a mutable state. I was wondering if this is true or, in other words, how one would model objects in a functional programming language. From my basic knowledge of Haskell I thought that one could use monads in some way, but I really do not know enough on this topic to come up with a clear answer. So, how are entities with an identity and a mutable persistent state normally modelled in a functional language? EDIT Here are some further details to clarify what I have in mind. Take a typical Java application in which I can (1) read a record from a database table into a Java object, (2) modify the object in different ways, (3) save the modified object to the database. How would this be implemented e.g. in Haskell? I would initially read the record into a record value (defined by a data definition), perform different transformations by applying functions to this initial value (each intermediate value is a new, modified copy of the original record) and then write the final record value to the database. Is this all there is to it? How can I ensure that at each moment in time only one copy of the record is valid / accessible? One does not want to have different immutable values representing different snapshots of the same object to be accessible at the same time.

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• Are small amounts of functional programming understandable by non-FP people?

  - by kd35a

  Case: I'm working at a company, writing an application in Python that is handling a lot of data in arrays. I'm the only developer of this program at the moment, but it will probably be used/modified/extended in the future (1-3 years) by some other programmer, at this moment unknown to me. I will probably not be there directly to help then, but maybe give some support via email if I have time for it. So, as a developer who has learned functional programming (Haskell), I tend to solve, for example, filtering like this: filtered = filter(lambda item: included(item.time, dur), measures) The rest of the code is OO, it's just some small cases where I want to solve it like this, because it is much simpler and more beautiful according to me. Question: Is it OK today to write code like this? How does a developer that hasn't written/learned FP react to code like this? Is it readable? Modifiable? Should I write documentation like explaining to a child what the line does? # Filter out the items from measures for which included(item.time, dur) != True I have asked my boss, and he just says "FP is black magic, but if it works and is the most efficient solution, then it's OK to use it." What is your opinion on this? As a non-FP programmer, how do you react to the code? Is the code "googable" so you can understand what it does? I would love feedback on this :) Edit: I marked phant0m's post as answer, because he gives good advice on how to write the code in a more readable way, and still keep the advantages. But I would also like to recommend superM's post because of his viewpoint as a non-FP programmer.

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• Do there exist programming languages where a variable can truly know its own name?

  - by Job

  In PHP and Python one can iterate over the local variables and, if there is only once choice where the value matches, you could say that you know what the variable's name is, but this does not always work. Machine code does not have variable names. C compiles to assembly and does not have any native reflection capabilities, so it would not know it's name. (Edit: per Anton's answer the pre-processor can know the variable's name). Do there exist programming languages where a variable would know it's name? It gets tricky if you do something like b = a and b does not become a copy of a but a reference to the same place. EDIT: Why in the world would you want this? I can think of one example: error checking that can survive automatic refactoring. Consider this C# snippet: private void CheckEnumStr(string paramName, string paramValue) { if (paramName != "pony" && paramName != "horse") { string exceptionMessage = String.Format( "Unexpected value '{0}' of the parameter named '{1}'.", paramValue, paramName); throw new ArgumentException(exceptionMessage); } } ... CheckEnumStr("a", a); // Var 'a' does not know its name - this will not survive naive auto-refactoring There are other libraries provided by Microsoft and others that allow to check for errors (sorry the names have escaped me). I have seen one library which with the help of closures/lambdas can accomplish error checking that can survive refactoring, but it does not feel idiomatic. This would be one reason why I might want a language where a variable knows its name.

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• An XEvent a Day (3 of 31) – Managing Event Sessions

  - by Jonathan Kehayias

  Yesterdays post, Querying the Extended Events Metadata , showed how to discover the objects available for use in Extended Events.  In todays post, we’ll take a look at the DDL Commands that are used to create and manage Event Sessions based on the objects available in the system.  Like other objects inside of SQL Server, there are three DDL commands that are used with Extended Events; CREATE EVENT SESSION , ALTER EVENT SESSION , and DROP EVENT SESSION .  The command names are self...(read more)

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• An XEvent a Day (31 of 31) – Event Session DDL Events

  - by Jonathan Kehayias

  To close out this month’s series on Extended Events we’ll look at the DDL Events for the Event Session DDL operations, and how those can be used to track changes to Event Sessions and determine all of the possible outputs that could exist from an Extended Event Session.  One of my least favorite quirks about Extended Events is that there is no way to determine the Events and Actions that may exist inside a Target, except to parse all of the the captured data.  Information about the Event...(read more)

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• Manufacturing Leadership 2011 Awards Event, Oracle Winners!

  - by stephen.slade(at)oracle.com

  Ready to Revolutionize Manufacturing?During the annual Manufacturing Leadership 2011 awards event, over 20 Oracle customers will be receiving leadership awards in various categories for mastery in applications, technology and/or innovation. Held at the Breakers Hotel in Palm Beach May 6-9, Oracle will sponsor exhibits and speaking engagements as well as hosting customers and prospects at the event.If you are in manufacturing and want to achieve the upper quartile of performance, up with the best-in-class performers, this is the event you should consider attending. Four time Superbowl champion quarterback Terry Bradshaw will be the Keynote speaker.Event Link: http://blog.managingautomation.com/summit/

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• What if(event) statement means in JavaScript?

  - by j flo

  I'm rather new to JavaScript and programming in general so I am pretty much only used to seeing if statements that have some kind of comparison operator like, if (x < 10) or if(myBool). I have seen an if statement checking against an event, but I don't understand what or why the event is being checked like that. What's the semantic meaning behind that check or comparison? Here is the code in question: if(event){ event.preventDefault(); }

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• Web Based Project Management System

  We are very well aware about the software development life cycle and project management system. But many of the developers assume that it is available only as desktop application. But now a days there are many online web based project management tools are available in market. In this article I am providing information about what is web based project management system, the available open source web based PMS and the benefits of using web based project management system for business owners.

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• The first SQL Server in the Evening event

  - by GavinPayneUK

  On Wednesday 19 th January I held my first SQL Server in the Evening event at VMware’s UK headquarters in Frimley, Surrey and while the event opened my eyes as to the amount of work needed before and after the event it would not have been possible without four groups of people: Those who attended – I think I counted around 18 of you, the event was for you so I’m glad you came and later said you’d all come again. Those who hosted us – VMware – we were given the nicest facilities you could have asked...(read more)

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• Repeater itemdatabound event value type and reference type

  - by Sune

  Im trying to bind a list with datetime objects to my repeater. if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item) { DateTime actualDate = e.Item.DataItem as DateTime; } When I want access the itemdatabound event on the repeater Then I get an errormessage which says that DateTime is a valuetype and not a reference type. My solution is that a wrap the datetime in a custom object (reference type) and pass that to the repeater datasource instead of the datetime. But Im wondering if there are other solutions where the repeater takes valuetypes (DateTime objects)........

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• How to get a continuous Touch Event?

  - by daliz

  My class extends View and I need to get continuous touch events on it. If I use: public boolean onTouchEvent(MotionEvent me) { if(me.getAction()==MotionEvent.ACTION_DOWN) { myAction(); } return true; } ... the touch event is captured once. What if I need to get continuous touches without moving the finger? Please, tell me I don't need to use threads or timers. My app is already too much heavy. Thanks.

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• Suggest a solution for event notification using nServiceBus

  - by iMahesh

  Currently we are looking for a solution to have unique profile for our user. We are having a different set of applications and the different profiles like is SAP , in DB and in AD too. We want to make sure If user alters his/her profile from any of application it should have replicate in all the data sources. We are looking for NServiceBus as the option for event notification as all subscribed applications will receive notification through bus if there is any change. Can anyone suggest me solution based on the NServiceBus? What pros/cons will be there?

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• disable event-bubbling c# wpf

  - by Ruben

  Hi, I'm having the following problem: When I got two labels into each other: <Label x:Name="First" MouseUp="Label_MouseUp"> <Label x:Name="Second" MouseUp="Label_MouseUp_1">This is a label into another label</Label> </Label> And the following code: private void Label_MouseUp(object sender, MouseButtonEventArgs e) { Console.WriteLine("Do NOT show me"); } private void Label_MouseUp_1(object sender, MouseButtonEventArgs e) { Console.WriteLine("Show me"); } When i click "Second", I want it to trigger only "Label_MouseUp_1". But in my console i get: Show me Do NOT show me Is there a way to turn off the bubbling events? (also, "First" has to be clickable, so removing the event there doesn't solve the problem) Thnx

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• Programming an Event listener for files in a directory on Linux

  - by Epitaph

  On Ubuntu linux, when you watch a flash video, it gets saved temporarily in the /tmp as flv files while the video buffers. I use vlc to directly play these files. Currently, I have scripted a shortcut that directly scans and opens the latest file in /tmp with vlc, when clicked. But, I want to program a Java application that will continually monitor this /tmp directory for any new flv files, and open it in vlc automatically. I know I can use Runtime.exec() to open the VLC application with the flv files. But, I DO NOT want to run a while(true) loop (with sleep) to scan for files. How can I make use of Event Handling (Java or any other language) on Linux to complete this task?

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• jQuery event handler queue

  - by resopollution

  Overview of the problem In jQuery, the order in which you bind a handler is the order in which they will be executed if you are binding to the same element. For example: $('#div1').bind('click',function(){ // code runs first }); $('#div1').bind('click',function(){ // code runs second }); But what if I want the 2nd bound code to run first? . My current solution Currently, my solution is to modify the event queue: $.data(domElement, 'events')['click'].unshift({ type : 'click', guid : null, namespace : "", data : undefined, handler: function() { // code } }); . Question Is there anything potentially wrong with my solution? Can I safely use null as a value for the guid? Thanks in advance. .

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• Game Key Events: Event or Method Overload?

  - by Ell

  If you were going to develop a game in say, Ruby, and you were provided with a game framework, would you rather act on key up/down events by overloading a method on the main window like so: class MyGameWindow < Framework::GameWindow def button_down(id) case id when UpArrow do_something when DownArrow do_something end end end Or have an event class with which you can make a method and assign a handle to it, like so: class MyGameWindow < Framework::GameWindow def initialize key_down.add_handler(method(:do_something)) end def do_something puts "blah blah" end end Please give your views, which do you think would be better in a game developement area, and thanks in advance, ell.

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• AppDomain.UnhandeledException event not fired

  - by Yaakov Davis

  In a WPF application, the app simply crashes, without the above event being fired. (I'm also registered to DispatcherUnhandeledException, which doesn't fire as well.) I conclude that it doesn't fire since the handler is defined to place a log entry. When looking at the log, there's no corresponding entry. It happens in a production environment; I'm unable to point at a particular scenario. I've read few descriptions on scenarios where this might happen, but I still don't have a clear grasp on this. Can anyone share his experience / knowledge on this? How can I find the root of the crash and solve it? Many thanks.

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• jquery target link click event

  - by Don

  $('input[name="iplus"]').click(function() { $(ol).append("<a href='#' title='delposition' class='beschr-"+($("#billsumary ol>li").length+1)+"'>l&ouml;schen</a>"); }); Hi, i like to target the created link like $('a[title='delposition']') and assign a click-event like: $("a[title='delposition']").click(function() { alert("Link klicked ..."); }); ...but this dont work? in order to further on retrieve the classname of that link..

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• jQuery Event Keypress: Which key was pressed?

  - by BlaM

  With jQuery, how do I find out which key was pressed when I bind to the keypress event? $('#searchbox input').bind('keypress', function(e) {}); I want to trigger an submit when ENTER is pressed. [Update] Even though I found the (or better: one) answer myself, there seems to be some room for variation ;) Is there a difference between keyCode and which - especially if I'm just looking for ENTER, which will never be a unicode key? Do some browsers provide one property and others provide the other one?

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• Jquery: change event to input file on IE

  - by cmedeiros

  Hello guys, I already looked all around, and can't find a solution: I have a form to upload files, and it should fire the submit after the file selection. On FF/Chrome it goes weel, and submit the form after file selection, but I can't do this on ie. Already tried with click/propertychange but nothing happens. Some code I already tried: $("#attach").attr("onChange", "alert('I changed')"); $("#attach").live($.browser.msie? 'propertychange': 'change', function(e) { ... }); Any sugestions to I try? Thanks for any help Edit1: I think there's a important information, this input file, is created on the fly, because of it I use .live() to bind the event

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• JavaScript event window.onload not triggered

  - by Bernhard V

  Hi! I've got the following code in a website: window.onload = resize; window.onresize = resize; function resize(){ heightWithoutHeader = (window.innerHeight - 85) + "px"; document.getElementById("haupttabelle").style.height = heightWithoutHeader; document.getElementById("navBar").style.height = heightWithoutHeader; } The onresize works fine, but the onload event never fires. I've tried it in Firefox and Chrome and neither of them works. Thank you for your help and go for the reputation! ;D

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