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  • Why does this anonymous function starting with println result in a NullPointerException?

    - by noahz
    I am learning about pmap and wrote the following function: (pmap #((println "hello from " (-> (Thread/currentThread) .getName)) (+ %1 %2)) [1 1 1] [-1 -1 -1]) When run, the result is a NullPointerException (hello from clojure-agent-send-off-pool-4 hello from clojure-agent-send-off-pool-3 hello from clojure-agent-send-off-pool-5 NullPointerException user/eval55/fn--56 (NO_SOURCE_FILE:11) Why is this happening? I have understood and observed the body of a fn to be an implicit do.

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  • MVC alternatives: examples of MVA & AVC?

    - by Phillip Oldham
    I'm interested in learning about the alternative patterns to Model-View-Controller, specifically the Model-View-Adapter and Application-View-Controller patterns. Google results tend to be either a high-level overview or Java-based. Can anyone either provide, or point me to, an example of these patterns in either PHP, Python or JavaScript?

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  • Differences between Zend Framework 1.8 and 1.10

    - by Pat
    I want to start learning Zend Framework. My only concern is that the most recent ZF book on Amazon with good reviews teaches version 1.8 of the framework, which is now about a year old. Do you think it would be a good idea to still pick up that book or is it too old now?

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  • Is the following array really multidimensional?

    - by flockofcode
    Book I’ learning from claims that intArray has two dimensions. But since calling intArray.GetLength(1) will result in an IndexoutOfRange exception, couldn’t we claim that unlike rectangular arrays, intArray isn’t really multidimensional and thus has only one dimension? int[][] intArray=new int[3][]; thank you

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  • Is two-finger non-homerow touch-typing for programming acceptable?

    - by codebliss
    I'm currently typing about 90 wpm (from http://speedtest.10-fast-fingers.com/ 90 correct 0 missed) using two fingers and the occasional ring or index. This probably grew from learning to type at an early age, before home-row was presented to me. Is this acceptable? Do people religiously endorse home-row even with low-mistake poking without looking at the keyboard?

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  • Bash, no-arguments warning, and case decisions

    - by Werner
    Hi, I am learning bash. I would like to do a simple script that, when not arguments given, shows some message. And when I give numers as argument,s depending on the value, it does one thing or another. I would also like to know suggestions for the best online manuals for beginners in bash Thanks

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  • Execution issue with PyModule_AddIntConstant function

    - by karnol
    I m learning python c api functions and keen to learn python 3.1 stable version. Found an unresolved issue recently and tried PyModule_AddIntConstant(PyObject *module, const char *name, long value) Runtime error occurred for this function call. Is there something wrong with the function in python 3.1?

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  • Determining the word width in C

    - by das_weezul
    Hi! I'm learning C right now and so I'm fiddling about with pointers. Is there a way to determine the word width of the CPU in C because I'm writing a small program which prints it's own stack (Because I'm curious how it is structured), so that information would come in handy. Right now I'm using an int pointer, as an integer is 4 Bytes wide and I'm using a 32-bit Intel Atom CPU. Thanks in advance, C gurus ;o)

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  • difference between -> and . for member selection operator.

    - by TimothyTech
    in this book i have I'm learning pointers, and i just got done with the chapter about OOP (spits on ground) anyways its telling me i can use a member selection operator like this ( - ). it sayd that is is like the "." except points to objects rather than member objects. whats the difference, it looks like it is used the same way...

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  • C Language Standard Collections Where Are They?

    - by flaxeater
    I have committed to learning C now, I'm good with Python/PHP/Bash but I've decided I'm limited by not being fluent in C. However I cannot imagine working in a language without lists and hashes, maybe I'm just jumping a gun, but surely there are 'standard' collection libraries. I do not see any in the GNU standard lib though, any suggestions?

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  • Neural Network 0 vs -1

    - by Louis
    I have seen a few times people using -1 as opposed to 0 when working with neural networks for the input data. How is this better and does it effect any of the mathematics to implement it? Edit: Using feedforward and back prop Edit 2: I gave it a go but the network stopped learning so I assume the maths would have to change somewhere?

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  • Could you please suggest any good books for Java EE

    - by attal
    Hi people, I am comfortable with Java SE 6 and I wanted to go deeper into Java by learning Java EE 6. However, I am confused and I don't know which book(s) should I read to master Java EE 6 (I have never learned Java EE previously). Could you please suggest any appropriate book(s) to help me master Java EE completely? Thank you for reading

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  • How to create temporary files in memory visible for other process, using python

    - by LazyMiha
    Hello! I`m trying to write simple batch file generator in python. Batch file consist of about 30-50 lines of text and is passed to other applications. During the execution of script there a lot of calls to external applications. I want to create file in memory (like named pipes in win32). Is there any platform independ way? p.s. sorry for possible mistakes in text, I'm still learning English

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  • java beginner wants to learn Hibernate

    - by Ashwath
    I am a java beginner and so far have completed learning the core java concepts except io chapter. I also want to finish up the j2ee material and other stuffs like hibernate, springs and struts . At present I have good knowledge of Java . please guide me that how can i finish up studying Hibernate, Springs and Struts in 2 days without going through J2ee in detail .Since I am preparing for the interview ? thanks for the help..

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  • What does this mean in AS3?

    - by uther-lightbringer
    Hello I've started to learning AS3 from one book and found something I don't understand. Ellipse(_board[row][column]).fill = getFill(row, column); _board is two dimensional array of Ellipse type, so I just dont understand why is Ellipse(Ellipse object) used when it apparently works without it, or I haven't seen any changes when I omitted it.

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  • How to link a UIViewController to a NIB file?

    - by jcdmb
    Hi everyone, I'm reading O'reilly's Learning iPhone Programming and on page 79 it says I have to create a new file (UIViewController subclass) and thick the checkbox to ask Xcode to generate an associated NIB file. The problem is: I do not have this option in my XCode 3.1 (this options is from XCode 3.2). So, I have to do it manually, and I don't know how. Could someone please help me? Thanks in advance!

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  • C# ASP.Net WebForm Membership Extra User Details (Profile)

    - by user1638362
    I'm learning how to use the ASP.net membership, when a user registers they just create a username and password, however i want to create a page on my website called "profile" where they can fill in extra details such as firstname, lastname, date of birth ect. However i don't see where i can place this in the asp.net membership database. Theres an asp.net_profile table however i'm not sure how this works. Could someone please explain how i can do this?

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  • Developing Bots__Where can I start?

    - by user947659
    i have a pet programming goal: to develop a bot for a game. Now, this won't be anything malicious, and I just want to do this to further my knowledge in programming. Can anyone help me out by pointing to where i can start learning how to develop a bot? the type of bots i want to make are video game bots (online multiplayer, first person shooters, and offline games(like solitaire and such)). Thanks!

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