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• What are approaches for analyzing the cost-benefits of a development methodology?

  - by Garrett Hall

  There are many development practices (TDD, continuous integration, cowboy-coding), principles (SOLID, layers of abstraction, KISS), and processes (RUP, Scrum, XP, Waterfall). I have learned you can't follow any of these blindly, but have to consider context and ROI (return on investment). My question is: How do you know whether you are getting a good ROI by following a particular methodology? Metrics, guesstimation, experience? Do analytical methods exist? Or is this just the million-dollar question in software engineering that has no answer?

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• What should I call the process of converting an object to a string?

  - by shabbychef

  We are having a game of 'semantic football' in the office over this matter: I am writing a method for an object which will represent the object as a string. That string should be such that when typed (more likely, cut and pasted) into the interpreter window (I will keep the language name out of this for now), will produce an object which is, for our purposes, identical to the one upon which the method was called. There is a spirited discussion over the 'best' name for this method. The terms pickle, serialize, deflate, etc have been proposed. However, it seems that those terms assume some process for the de-pickling (unserialization, etc) that is not necessarily the language interpreter itself. That is, they do not specifically refer to the case where strings of valid code are produced. This is closer to a quine, but we are re-producing the object not the code, so this is not quite right. any suggestions?

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• Author's work and copyright. in UI design

  - by c-smile

  Typical situation in UI design: you do design of some UI and, say, came up with some bright new idea like "ribbon" or "kinetic scroll past end". What would be the strategy about such thing? Register patent, don't like it, but anyway would like to ask: how long it takes to do all this stuff and how much it will cost in average? If to forget about patents, will the idea have something like "prior art" status or some such if someone will try to patent this in future? All this about project / product published by solo developer.

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• REST API at backend and MVC Javascript framework at client side

  - by Prashere

  I am building an online social network. I have finished writing RESTful API service using Django. This will return only JSON response (No HTML will be generated from server side) so that this JSON response can be used to build native smartphone apps. API service being common to all clients. My question is, since there is no HTML response from server side, can the MV* Javascript Frameworks like Angular / Backbone / Ember take care of complete Front-end, right from generating HTML page with CSS?

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• Randomly generate directed graph on a grid

  - by Talon876

  I am trying to randomly generate a directed graph for the purpose of making a puzzle game similar to the ice sliding puzzles from Pokemon. This is essentially what I want to be able to randomly generate: http://bulbanews.bulbagarden.net/wiki/Crunching_the_numbers:_Graph_theory. I need to be able to limit the size of the graph in an x and y dimension. In the example given in the link, it would be restricted to an 8x4 grid. The problem I am running into is not randomly generating the graph, but randomly generating a graph, which I can properly map out in a 2d space, since I need something (like a rock) on the opposite side of a node, to make it visually make sense when you stop sliding. The problem with this is that sometimes the rock ends up in the path between two other nodes or possibly on another node itself, which causes the entire graph to become broken. After discussing the problem with a few people I know, we came to a couple of conclusions that may lead to a solution. Including the obstacles in the grid as part of the graph when constructing it. Start out with a fully filled grid and just draw a random path and delete out blocks that will make that path work. The problem then becomes figuring out which ones to delete to avoid introducing an additional, shorter path. We were also thinking a dynamic programming algorithm may be beneficial, though none of us are too skilled with creating dynamic programming algorithms from nothing. Any ideas or references about what this problem is officially called (if it's an official graph problem) would be most helpful. Here are some examples of what I have accomplished so far by just randomly placing blocks and generating the navigation graph from the chosen start/finish. The idea (as described in the previous link) is you start at the green S and want to get to the green F. You do this by moving up/down/left/right and you continue moving in the direction chosen until you hit a wall. In these pictures, grey is a wall, white is the floor, and the purple line is the minimum length from start to finish, and the black lines and grey dots represented possible paths. Here are some bad examples of randomly generated graphs: http://i.stack.imgur.com/9uaM6.png Here are some good examples of randomly generated (or hand tweaked) graphs: i.stack.imgur.com/uUGeL.png (can't post another link, sorry) I've also seemed to notice the more challenging ones when actually playing this as a puzzle are ones which have lots of high degree nodes along the minimum path.

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• Database Driven Web Application, C# Front-End and F# Back-End meaning

  - by user1473053

  Hi I am an intern working with ASP.NET. My current task is to make a website which will incorporate some jquery viewing features. This project seems to me will be primarily dealing with reading data from a database and making graphs out of them. This will require me to make custom queries from whatever the client is looking at. I think it is going to be what this guy calls an Ad Hoc Query tool My plan for this is to make it a database-driven website. So I can utilize the jquery dynamic viewing capabilities. I stumbled upon the functional programming paradigm and found F#. I read that because of it's functional programming paradigm, it makes it a good language to do asynchronous functions. I read about how you can use this with LINQ to SQL and how easy it is to make queries without actually putting the query language in. I understand the concept of the MVC design pattern. But I don't understand what they mean about C# being the front-end and F# being the back-end. Can someone clarify this to me? Also what are your thoughts about doing this project in this way? Any comments and thoughts are greatly appreciated. I feel as if learning F# will be a great learning experience for me. My guess is that the F# back-end is like the part where it controls the calls to the database. F# is possibly the model part of the design pattern. And C# is the controller. So HTML, Javascript and Jquery stuff will be my View design pattern. Clarify please?

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• Internal and external API architecture

  - by Tacomanator

  The company I work for maintains a successful SaaS product that grew "organically" over the years. We are planning to expand the line with a suite of new products that will share data with the existing product. To support this, we are looking to consolidate business logic into a single place: a web service layer. The WS layer will be used by: The web applications A tool to import data A tool to integrate with other client software (not an API per se) We also want to create an API that can be used by our customers that are capable of using it to create their own integrations. We are struggling with the following question: Should the internal API (aka the WS layer) and the external API be one in the same, with security and permission settings to control what can be done by who, or should they be two separate applications where the external API just calls the internal API like any other application? So far in our debate it seems that separating them may be more secure, but will add overhead. What have others done in a similar situation?

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• Has anyone done CSDP certification?

  - by DPD

  I was looking at some certifications that can potentially enhance my knowledge and market value as a Software Engineer. IEEE's Certified Software Development Professional (CSDP) caught my attention. When I looked on the net for any user experiences with it I couldn't find anything substantial. Doesn't seem too popular. And I certainly havent heard of anyone in my organization or friends circle who have done it. I would like to know from community members if anyone has done this certification and their experiences with the same. Was the certification useful in terms of knowledge. Did it add weight to your resume (not deadweight!)?

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• SUM of metric for normalized logical hierarchy

  - by Alex254

  Suppose there's a following table Table1, describing parent-child relationship and metric: Parent | Child | Metric (of a child) ------------------------------------ name0 | name1 | a name0 | name2 | b name1 | name3 | c name2 | name4 | d name2 | name5 | e name3 | name6 | f Characteristics: 1) Child always has 1 and only 1 parent; 2) Parent can have multiple children (name2 has name4 and name5 as children); 3) Number of levels in this "hierarchy" and number of children for any given parent are arbitrary and do not depend on each other; I need SQL request that will return result set with each name and a sum of metric of all its descendants down to the bottom level plus itself, so for this example table the result would be (look carefully at name1): Name | Metric ------------------ name1 | a + c + f name2 | b + d + e name3 | c + f name4 | d name5 | e name6 | f (name0 is irrelevant and can be excluded). It should be ANSI or Teradata SQL. I got as far as a recursive query that can return a SUM (metric) of all descendants of a given name: WITH RECURSIVE temp_table (Child, metric) AS ( SELECT root.Child, root.metric FROM table1 root WHERE root.Child = 'name1' UNION ALL SELECT indirect.Child, indirect.metric FROM temp_table direct, table1 indirect WHERE direct.Child = indirect.Parent) SELECT SUM(metric) FROM temp_table; Is there a way to turn this query into a function that takes name as an argument and returns this sum, so it can be called like this? SELECT Sum_Of_Descendants (Child) FROM Table1; Any suggestions about how to approach this from a different angle would be appreciated as well, because even if the above way is implementable, it will be of poor performance - there would be a lot of iterations of reading metrics (value f would be read 3 times in this example). Ideally, the query should read a metric of each name only once.

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• How do you get past the Analysis to Paralysis when working on a new project?

  - by Cape Cod Gunny

  I've been struggling with how to get my project going. I've got an old software package that is in need of desparate rewrite. I haven't compiled the source code since 2004. It still sells, it's stable but does require the “Run this program in compatibility mode for:” on a lot of the newer windows systems. It's also one of those hard coded 640 X 480 screen resolution programs. Yuck! I can't seem to get started with this rewrite. I'm constantly fiddling around with different things. I'll play around with different fluid layouts for a while. Then I start looking around at how the main menu should work/look. I quickly find out that there's this thing called "Cool Bars" and I'll spend hours playing with that. Then I start thinking about stuff like "Oh I need to make sure that the screen sizes are preserved so when the application gets relaunched it remebers how the screens were positioned." Which leads to what happens if they have two monitors? Which leads to what happens if they have a quad screen? Yikes it's got to stop. I have always been a slow starter. I think about stuff long and hard up front. This has always plagued me. Once I get my mind made up then bam... I'm off and running. I'm looking for advice from some other one-person software companies that can help someone like me get off to a quicker start?

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• Too early to apply for post-graduation jobs?

  - by Rob Lourens

  I graduate in May 2012. I'm on an internship with one company right now that will probably make me an offer in August, but I will only have a couple weeks to take or leave it. I'm not sure whether I'll want to accept it- it will depend on the specifics. So I plan to apply for other jobs to see if I can get another offer, but would it be too early to be applying over the next few weeks when I wouldn't start until next May at least? I hate to turn down an offer having nothing else lined up. I'm a software engineer at one large software company and I would apply for jobs at other large software companies. I assume a smaller company would work on a much shorter hiring schedule, but maybe large companies wouldn't mind hiring 8-9 months in advance? I also hate to start applying any earlier than I have to- I know I'll only have more experience and be more employable with time.

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• Static teams or dynamic teams?

  - by Richard DesLonde

  Is it better to assemble permanent teams of developers within the company that always work together, from project to project, or is it better to have dynamic teams that assemble for a project, and then dissasemble afterwards? My inclination is to treat the entire company as a "platoon" and to assemble "fireteams" for individual projects, choosing from the "platoon" those developers best suited for the project.

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• What's the problem with Scala's XML literals?

  - by Oak

  In this post, Martin (the language's head honcho) writes: [XML literals] Seemed a great idea at the time, now it sticks out like a sore thumb. I believe with the new string interpolation scheme we will be able to put all of XML processing in the libraries, which should be a big win. Being interested in language design myself, I'm wondering: Why does he write that it was a mistake to incorporate XML literals into the language? What is the controversy regarding this feature?

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• What's the equivalent name of "procedure" in OOP?

  - by AeroCross

  In several of my programming courses in the University, my teachers always told me the following: A function and a procedure are basically the same thing: the only difference is that a function returns a value, and the procedure doesn't. That means that this: function sum($a, $b) { return $a + $b; } ... is a function, and this: function sum($a, $b) { echo $a + $b; } ... is a procedure. In the same train of thought, I've seen that a method is the equivalent of a function in the OOP world. That means that this: class Example { function sum($a, $b) { return $a + $b; } } Is a method — but how do you call this? class Example { function sum($a, $b) { echo $a + $b; } } What's the equivalent name, or how do you call a method that doesn't returns anything?

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• If PHP websites represnt 70% of websites in my country then should I learn it?

  - by Fadi Tiwari

  In my country most of the sites are built using PHP and MySQL. Half of those sites use vbulletin and Wordpress. When it comes to companies, ministries and universities they use ASP.NET. I am not sure what should I learn to get more money as freelacer? Should I learn ASP.NET and focus my area to build companies and universities' sites? (And the question if they will know me one day and ask me to build any of their sites or not?) Or should I learn PHP and focus my business on people's sites and maybe some small formal sites? Which option will give me more money?

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• Metaobject protocol:Why is it known as an important concept

  - by sushant

  Metaobject protocol is protocol for metaobjects in a programming languages. Although I understand it on simple terms, I want to know the reason and a summary of real world usage patterns of this protocol. So, why exactly is metaobject and more importantly metaobject protocol is such a good idea. I want to know the problem which led to its evolution and also, its high power usage. Opinions as well as general overview/description/alternate explanations are also welcome.

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• Erlang node acts like it connects, but doesn't [migrated]

  - by Malfist

  I'm trying to setup a distributed network of nodes across a few firewalls and it's not going so well. My application is structured like this: there is a central server that always running a node ([email protected]) and my co-worker's laptops connect to it on startup. This works if we're all in the office, but if someone is at home, they can connect to the masternode, but they fail to connect to the other nodes in the swarm. I.E., erlang fails to gossip correctly. To correct this, I've change epmd's port number and changed the inet_dist_listen ports to a known open port (1755 and 7070 respectively). However, something fishy is going on. I can run net_adm:world() and it reports that it connects to master node, but when I run nodes() I get an empty array. Same with net_adm:ping('[email protected]'). See: Eshell V5.9 (abort with ^G) ([email protected])1> net_adm:world(). ['[email protected]'] ([email protected])2> nodes(). [] ([email protected])3> net_adm:ping('[email protected]'). pong ([email protected])4> nodes(). [] ([email protected])5> What's going on, and how can I fix it?

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• Are Intel compilers really better than the Microsoft ones?

  - by Rocket Surgeon

  Years ago, I was surprised when I discovered that Intel sells Visual Studio compatible compilers. I tried it in particular for C/C++ as well as fantastic diagnostic tools. But the code was simply not that computationally intensive to notice the difference. The only impression was: did Intel really do it for me just now, wow, amazing tools with nanoseconds resolution, unbelievable. But the trial ended and the team never seriously considered a purchase. From your experience, if license cost does not matter, which vendor is the winner? It is not a broad or vague question or attemt to spark a holy war. This sort of question is about two very visible tools. Nobody likes when tools have any mysteries or surprises. And choices between best and best are always the pain. I also understand the grass is always greener argument. I want to hear all "what ifs" stories. What if Intel just locally optimizes it for the chip stepping of the month, and not every hardware target will actually work as well as Microsoft compiled? What if AMD hardware is the target and everything will slow down for no reason? Or on the other hand, what if Intel's hardware has so many unnoticable opportunities, that Microsoft compiler writers are too slow to adopt and never implement it in the compiler? What if both are the same exactly, actually a single codebase just wrapped into two different boxes and licensed to both vendors by some third-party shop? And so on. But someone knows some answers.

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• Designing web-based plugin systems correctly so they don't waste as many resources?

  - by Xeoncross

  Many CMS systems which rely on third parties for much of their code often build "plugin" or "hooks" systems to make it easy for developers to modify the codebase's actions without editing the core files. This usually means an Observer or Event design pattern. However, when you look at systems like wordpress you see that on every page they load some kind of bootstrap file from each of the plugin's folders to see if that plugin will need to run that request. Its this poor design that causes systems like wordpress to spend many extra MB's of memory loading and parsing unneeded items each page. Are there alternative ways to do this? I'm looking for ideas in building my own. For example, Is there a way to load all this once and then cache the results so that your system knows how to lazy-load plugins? In other words, the system loads a configuration file that specifies all the events that plugin wishes to tie into and then saves it for future requests? If that also performs poorly, then perhaps there is a special file-structure that could be used to make educated guesses about when certain plugins are unneeded to fullfil the request. Any ideas? If anyone wants an example of the "plugin" concept you can find one here.

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• Composing programs from small simple pieces: OOP vs Functional Programming

  - by Jay Godse

  I started programming when imperative programming languages such as C were virtually the only game in town for paid gigs. I'm not a computer scientist by training so I was only exposed to Assembler and Pascal in school, and not Lisp or Prolog. Over the 1990s, Object-Oriented Programming (OOP) became more popular because one of the marketing memes for OOP was that complex programs could be composed of loosely coupled but well-defined, well-tested, cohesive, and reusable classes and objects. And in many cases that is quite true. Once I learned object-oriented programming my C programs became better because I structured them more like classes and objects. In the last few years (2008-2014) I have programmed in Ruby, an OOP language. However, Ruby has many functional programming (FP) features such as lambdas and procs, which enable a different style of programming using recursion, currying, lazy evaluation and the like. (Through ignorance I am at a loss to explain why these techniques are so great). Very recently, I have written code to use methods from the Ruby Enumerable library, such as map(), reduce(), and select(). Apparently this is a functional style of programming. I have found that using these methods significantly reduce code volume, and make my code easier to debug. Upon reading more about FP, one of the marketing claims made by advocates is that FP enables developers to compose programs out of small well-defined, well-tested, and reusable functions, which leads to less buggy code, and low code volume. QUESTIONS: Is the composition of complex program by using FP techniques contradictory to or complementary to composition of a complex program by using OOP techniques? In which situations is OOP more effective, and when is FP more effective? Is it possible to use both techniques in the same complex program? Do the techniques overlap or contradict each other?

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• Which prediction model for web page recommendation?

  - by Nilesh

  I am trying to implement a web page recommendation wherein registered users will be given a recommendation of which page to visit depending upon the previous data.So with initial study I decided to go on with clustering the data with rough sets and then will move forward to find out the sequential patters with the use of prefix span algorithm.So now I want to have a better prediction model in place which can predict the access frequency of pages.I have figured out with Markov model but still some more suggestions will be valuable.Also please help me with some references of the models too.Is it possible to directly predict the next page access with the result of PrefixSpan.If so how?

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• Is static universally "evil" for unit testing and if so why does resharper recommend it?

  - by Vaccano

  I have found that there are only 3 ways to unit test (mock/stub) dependencies that are static in C#.NET: Moles TypeMock JustMock Given that two of these are not free and one has not hit release 1.0, mocking static stuff is not too easy. Does that make static methods and such "evil" (in the unit testing sense)? And if so, why does resharper want me to make anything that can be static, static? (Assuming resharper is not also "evil".) Clarification: I am talking about the scenario when you want to unit test a method and that method calls a static method in a different unit/class. By most definitions of unit testing, if you just let the method under test call the static method in the other unit/class then you are not unit testing, you are integration testing. (Useful, but not a unit test.)

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• Transitioning from a mechanical engineer to software developer. What path to take?

  - by Patrick

  Hi all, I am 24 years old and have a BS in mechanical engineering from Mizzou. I have been working as a mechanical engineer in a big corporation for about 2 years since graduation. In this time, I have decided that I'm just not that interested in mechanical engineering topics, and I'm much more excited about web technology, website design, etc. I do a very small amount of freelance web design just to get experience, but I have no formal training yet. Ultimately I could see myself being very excited about working for a small startup in web technology, or creating and selling my own programs in more of an entrepreneurial role. What path do you recommend for transitioning into this field? Go back to school and get a BS in CS? MS in CS? Tech school for classes? Self study? I'm feeling overwhelmed by the options available, but the one thing I know for sure is that I'm excited to make a change. Thanks!

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• What approaches can I take to lower the odds of introducing new bugs in a complex legacy app?

  - by m.edmondson

  Where I work I often have to develop (and bug fix) in an old system (.NET 1) whos code is complete spaghetti - with little thought given to variable names, program structure nor comments. Because of this it takes me ages to understand what bits need changed, and I often 'break' the existing software because I've made a modification. I really really want to spend a couple of months (with colleagues) going through it to refactor but existing developers both can't see the need - nor think theres time for this (the system is massive). I dread having to work on its code as it takes days to fix something only to find out I've broken something else. This obviously makes me look incompetent - so how can I deal with this?

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• Pros and cons of developing modern services in Java

  - by r3mus

  I'm interested in the philosophical and architectural justification (or lack thereof) in using Java to develop in today's modern world (exclude mobile/embedded platforms of course). Why would one choose to develop (or not develop) a back-end in Java? Why would one choose to develop (or not develop) a front-end UI in Java? Why do large enterprises lean towards developing in Java rather than adopt more modern (and standardized) technologies? *disclaimer: I'm not a fan of Java in the enterprise, I'm simply curious what drives enterprises to continue the trend.

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