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  • What advantages switching to ruby might give me as a python programmer ?

    - by Richard Placide
    This is my first question on stackoverflow, so please bear with me. I'm trying to stay away from any form of trolling or flame baiting as i have a tremendous respect for both languages. I'm a python programmer (though not an expert) and i love it. My first language was C++. My line of work (web development) is pushing me towards other languages like php and javascript. Recently, I've been very excited by Ruby's increasing popularity. However I used to be under the impression that Python and Ruby were so close that there was little point in trying to learn and master both. But I get the sense that I was wrong, hence my question : I'd like to hear from python programmers who have either switched entirely to ruby or added ruby to their toolset. What specific benefits did you get from switching (entirely or partially) to Ruby from Python ? Ideally I'd like to hear from real world experiences.

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  • Understanding Backtracking in C++

    - by nikhil
    I have a good basic understanding of the fundamentals of C++, I also have an understanding of how recursion works too. I came across certain problems like the classic eight queens problem and solving a Sudoku with Backtracking. I realize that I'm quite lost when it comes to this, I can't seem to be able to get my mind around the concept of going back in the recursion stack and starting again in order to solve the problem. It seems easy with a pen and paper but when it comes to writing code for this, I'm confused on how to begin attacking these problems. It would be helpful if there were a tutorial aimed at beginners to backtracking or if there were a good book where this was covered. If somebody can shed light on this topic or give me some links to decent references, I'd be really grateful. And yes I do know that it would be easier in functional languages but I'd like to understand the implementation in imperative languages too.

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  • Multi-lingual error messages and error numbers

    - by Jon Hopkins
    So we're looking at the possibility of porting our software to support multiple languages and one of the areas we're going to have to deal with is error messages and other notifications. These obviously have to be reported to the users in their own language. Our team (largely) only speak English and even if we were all multi-lingual we're looking at selling to a wide range of countries and could never expect to have a reasonable number of people speaking all languages (we're a small company). The obvious way to get round the language issue when errors or other messages we may get asked about which are being reported is error numbers which would be consistent across language. While these are going to exist in the backend (if only as key on the error message), I'd really rather not throw them at users if we don't have to but I don't have any other solution. Anyone have any useful suggestions for alternatives?

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  • What's special about currying or partial application?

    - by Vigneshwaran
    I've been reading articles on Functional programming everyday and been trying to apply some practices as much as possible. But I don't understand what is unique in currying or partial application. Take this Groovy code as an example: def mul = { a, b -> a * b } def tripler1 = mul.curry(3) def tripler2 = { mul(3, it) } I do not understand what is the difference between tripler1 and tripler2. Aren't they both the same? The 'currying' is supported in pure or partial functional languages like Groovy, Scala, Haskell etc. But I can do the same thing (left-curry, right-curry, n-curry or partial application) by simply creating another named or anonymous function or closure that will forward the parameters to the original function (like tripler2) in most languages (even C.) Am I missing something here? There are places where I can use currying and partial application in my Grails application but I am hesitating to do so because I'm asking myself "How's that different?" Please enlighten me.

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  • Object-Oriented Operating System

    - by nmagerko
    As I thought about writing an operating system, I came across a point that I really couldn't figure out on my own: Can an operating system truly be written in an Object-Oriented Programming (OOP) Language? Being that these types of languages do not allow for direct accessing of memory, wouldn't this make it impossible for a developer to write an entire operating system using only an OOP Language? Take, for example, the Android Operating System that runs many phones and some tablets in use around the world. I believe that this operating system uses only Java, an Object-Oriented language. In Java, I have been unsuccessful in trying to point at and manipulate a specific memory address that the run-time environment (JRE) has not assigned to my program implicitly. In C, C++, and other non-OOP languages, I can do this in a few lines. So this makes me question whether or not an operating system can be written in an OOP, especially Java. Any counterexamples or other information is appreciated.

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  • Java - learning / migrating fast

    - by Yippie-Kai-Yay
    Hello! This is not one of those questions like "How do I learn Java extremely fast, I know nothing about programming, but I heard Java is cool, yo". I have an interview for a Java Software Developer in a couple of weeks and the thing is that I think that I know C++ really good and I am somewhat good at C# (like, here I can probably answer on a lot of questions related to these languages), but I have almost zero experience with Java. I have a lot of projects written in both languages, I participiated in several open-source projects (mostly C++, though). Now, what should I do (in your opinion) to prepare myself for this Java interview. I guess migrating from C# to Java should be kind of fast, especially when you know a lot about programming in global, patterns, modern techniques and have a lot of practical experience behind you. But still two weeks is obviously not enough to get Java in-depth - so what should I focus on to have the best chances to pass the interview? Thank you.

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  • I would like to know what kind of tools I should be looking for web development.

    - by user646636
    I would like to know what kind of tools I should be looking for web development. I have learned the basics of HTML/CSS/PHP/JS/phpmyadmin Now, I was looking to a write a website for purchasing and selling products for clients and sellers. I was wondering what other languages I would need to learn and also what kinda development tools I should use. Also, what would be the best type of language to write a website like this. I have heard that I should be using python for this type of web development. Do you guys have any suggestion as to what I should be looking at? And Also I would like to know if I should be setting up my own database or should I be using something like MySQL. I'm looking for languages that would have low maintenance cost in the long run. Thanks

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  • Are JSP and Java still relevant?

    - by dyyyy
    I've been working so long in java and jsp, that for me it's a no-brainer to use it. But now as I'm starting to do my own framework for web applications, I'm wondering if jsp is the right choice. Seing how much php is popular (as well as other languages as ruby and python) Is JSP still a relevant language. Does it have any clear advantage over other languages ? I don't want to use it just because i know it better. So please considering I know nothing, is there a reason to use JSP and JAVA? Thank you

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  • how do I go about removing all the language packs I don't need

    - by knotech
    I just noticed that in /usr/share/help I have the ubuntu help files in 70 different languages. I only speak 2, and I only really compute in one. I also noticed that it is full of broken symbolic links to /usr/share/help-langpack. I want just want to get rid of all the languages I don't need. How can I do this without getting all rm -r happy? I'm preferably looking for a way to do this without installing any new packages, as my main goal is to get rid of excess stuff on my machine. I'd like to find a way to do this preferably with dpkg, or apt.

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  • Catching Up with Lisp

    Support for multicore and Big Data are among the upcoming features of Franz's Lisp-based tools Lisp - Programming - Languages - FAQs Help and Tutorials - Compilers and Interpreters

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  • Naming: objectAction or actionObject?

    - by DocSalvage
    The question, Stored procedure Naming conventions?, and Joel's excellent Making Wrong Code Look Wrong article come closest to addressing my question, but I'm looking for a more general set of criteria to use in deciding how to name modules containing code (classes, objects, methods, functions, widgets, or whatever). English (my only human language) is structured as action-object (i.e closeFile, openFile, saveFile) and since almost all computer languages are based on English, this is the most common convention. However, in trying to keep related code close together and still be able to find things, I've found object-action (i.e. fileClose, fileOpen, fileSave) to be very attractive. Quite a number of non-English human languages follow this structure as well. I doubt that one form is universally superior, but when should each be used in the pursuit of helping to make sure bad code looks bad?

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  • What do you call "X <= $foo <= Y" comparison?

    - by Jakob
    While writing a Perl statement like if ( $foo >= X && $foo <= Y ) yet again, I wondered why many programming languages do not support the more comfortable form if ( X <= $foo <= Y ) and what this is called. I came up with "3-legged comparison" but no results when searching for it. By the way there is also the "element-of-set" form if ( $foo in X..Y ) which I only consider more readable when provided via a short keyword. Is there a term for X <= $foo <= Y comparison? Which languages support it?

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  • Using an actor model versus a producer-consumer model?

    - by hewhocutsdown
    I'm doing some early-stage research towards architecting a new software application. Concurrency and multithreading will likely play a significant part, so I've been reading up on the various topics. The producer-consumer model, at least how it is expressed in Java, has some surface similarities but appears to be deeply dissimilar to the actor model in use with languages such as Erlang and Scala. I'm having trouble finding any good comparative data, or specific reasons to use or avoid the one or the other. Is the actor model even possible with Java or C#, or do you have do use one of the languages built for the purpose? Is there a third way?

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  • Is there a quasi-standard set of attributes to annotate thread safety, immutability etc.?

    - by Eugene Beresovksy
    Except for a blog post here and there, describing the custom attributes someone created, but that do not seem to get any traction - like one describing how to enforce immutability, another one on Documenting Thread Safety, modeling the attributes after JCIP annotations - is there any standard emerging? Anything MS might be planning for the future? This is something that should be standard, if there's to be any chance of interoperability between libraries concurrency-wise. Both for documentation purposes, and also to feed static / dynamic test tools. If MS isn't doing anything in that direction, it could be done on CodePlex - but I couldn't find anything there, either. <opinion>Concurrency and thread safety are really hard in imperative and object-languages like C# and Java, we should try to tame it, until we hopefully switch to more appropriate languages.</opinion>

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  • Why isn't there a python compiler to native machine code?

    - by user2986898
    As I understand, the cause of the speed difference between compiled languages and python is, that the first compiles code all way to the native machine's code, whereas python compiles to python bytecode, to be interpreted by the PVM. I see that this way python codes can be used on multiple operation system (at least in most cases), however I do not understand, why is not there an additional (and optional) compiler for python, which compiles the same way as traditional compilers. This would leave to the programmer to chose, which is more important to them; multiplatform executability or performance on native machine. In general; why are not there any languages which could be behave both as compiled and interpreted?

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  • Learning Programming, Suggestions for a roadmap

    - by RisingSun
    Hi, Some background first- I am new to programming and have discovered it rather late in life; Like many hobbyists, my introduction to the subject has been through php/jquery (yes, i know the popular mood around here... they-are-not-real-programminng-languages ;-) ). I like to believe that I am reasonably competent at what I do in my other life and this developing addiction to coding has taken a very heavy toll on my professional prospects. This is the question: What programming languages next? (No plans to ditch php in the immediate future, that will involve rewriting much of my code) Any absolutely essential books I must read? Is it necessary to join a college/university course? Do I need to ditch my other profession to continue serious learning? My goals are: Develop a solid understanding of the science and art of programming. Continue to work on my own web application (Hands on learning suits me best) I am something of a generalist interested in everything from UI to database performance

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  • HedgeWar code confusion

    - by BluFire
    I looked at an open source project(HedgeWars) that was built using many programming languages such as C++ and Java. While I was looking through the code, I couldn't help noticing that all the math and physics were gone from the Java code. HedgeWars I imported the project file called "SDL-android-project" which was a sub folder to "android build" and project files. My question is where is all the math and physics inside the code? Do I have to look at the C++ code in order to see it? I think Hedgewars was originally programmed in C++ but the files are confusing be because of its size and the fact that it has several programming languages inside.

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  • How does PHP5 fare with earlier versions of the language

    - by Pankaj Upadhyay
    I would like to learn PHP for web development but have been drawn back because of comments like the following*: PHP is good but generates spaghetti code PHP is nice but Python is marriage material PHP lacks stuff that you get in other languages like C# or Java But for PHP5 I have seen some promising comments. So, my question is: How does PHP5 fare with earlier versions of the language and is it good enough now to learn for web development. * Comments are just for reference not to incite a flame war. No comparison of PHP with other languages is asked for here. Please comment just on PHP5 and how it compares with earlier versions.

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  • How does PHP5 fare with the earlier versions of the language

    - by Pankaj Upadhyay
    Many times, I like to learn PHP for web development but been drawn back due to comments like the following :- (Comments are just for reference and does not invite Flame-war) "PHP is good but generates spaghetti code" "PHP is nice but Python is marriage material" "PHP lags stuff that you get in other languages like C# or JAVA" But for PHP5 i have seen some promising comments. So, What my question is how does PHP5 fare with the earlier versions of the language and is it good enough now to learn for web development. NOTE:- No comparison of PHP with other languages is sorted here. Please comment just on PHP and it's comparison with itself

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  • The Buzz at the JavaOne Bookstore

    - by Janice J. Heiss
    I found my way to the JavaOne bookstore, a hub of activity. Who says brick and mortar bookstores are dead? I asked what was hot and got two answers: Hadoop in Practice by Alex Holmes was doing well. And Scala for the Impatient by noted Java Champion Cay Horstmann also seemed to be a fast seller. Hadoop in PracticeHadoop is a framework that organizes large clusters of computers around a problem. It is touted as especially effective for large amounts of data, and is use such companies as  Facebook, Yahoo, Apple, eBay and LinkedIn. Hadoop in Practice collects nearly 100 Hadoop examples and presents them in a problem/solution format with step by step explanations of solutions and designs. It’s very much a participatory book intended to make developers more at home with Hadoop.The author, Alex Holmes, is a senior software engineer with more than 15 years of experience developing large-scale distributed Java systems. For the last four years, he has gained expertise in Hadoop solving Big Data problems across a number of projects. He has presented at JavaOne and Jazoon and is currently a technical lead at VeriSign.At this year’s JavaOne, he is presenting a session with VeriSign colleague, Karthik Shyamsunder called “Java: A Perfect Platform for Data Science” where they will explain how the Java platform has emerged as a perfect platform for practicing data science, and also talk about such technologies as Hadoop, Hive, Pig, HBase, Cassandra, and Mahout. Scala for the ImpatientSan Jose State University computer science professor and Java Champion Cay Horstmann is the principal author of the highly regarded Core Java. Scala for the Impatient is a basic, practical introduction to Scala for experienced programmers. Horstmann has a presentation summarizing the themes of his book on at his website. On the final page he offers an enticing summary of his conclusions:* Widespread dissatisfaction with Java + XML + IDEs               --Don't make me eat Elephant again * A separate language for every problem domain is not efficient               --It takes time to master the idioms* ”JavaScript Everywhere” isn't going to scale* Trend is towards languages with more expressive power, less boilerplate* Will Scala be the “one ring to rule them”?* Maybe              --If it succeeds in industry             --If student-friendly subsets and tools are created The popularity of both books echoed comments by IBM Distinguished Engineer Jason McGee who closed his part of the Sunday JavaOne keynote by pointing out that the use of Java in complex applications is increasingly being augmented by a host of other languages with strong communities around them – JavaScript, JRuby, Scala, Python and so forth. Java developers increasingly must know the strengths and weaknesses of such languages going forward.

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