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  • Should every programmer keep a "Lessons Learned" journal?

    - by gablin
    Every time I've finished a project, there is always something that I've learned (otherwise I don't find it very motivating). But I can't remember everything, and much later I may stumble across the same problem that I encountered in a previous project but no longer how I solved it (or at least what attempts I made). So would it be a good idea to write this down in a journal of some sort? I know that writing stuff down feels like writing documentation (which not everyone enjoys doing), and hope our memory to serve us when needed. But having it documented, it could be shared with other programmers and learn what lessons they learned. So, what do you think?

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  • How to keep balance / Unlock items / achievement rules

    - by Mark Knol
    I'm working on an engine for a game, too learn javascript and just because its fun. I'm a flashdeveloper, I know how to build websites. Now making games is a different challenge, javascript is a challenge, but I'd love to learn how to structure code and what patterns are common. I dont mind if the game ever finish, I'm mostly interested in the programming part of it. I dont have a particular endresult in mind, so I'll see where it takes me. I currently have a system where you can buy items. The items cost a specified amount of gold, silver, diamonds etc. When you have selected and bought the item, it takes time before getting rewarded. When time is over, you are getting rewarded with other properties (gold, energy, diamonds). For example, you can buy an apple for 50gold, It takes a minute, you get rewarded with 75energy. Or if you take a run, it cost 50energy, it takes 5minutes, reward is 25gold and 25silver. These definitions is what i call actions. Currently I already have a system where this already works and I can define as much actions with as much properties as I want. The definitions I have kinda looks like this: {id:101, category:544, onInit:{gold:-75}, onComplete:{energy:75}, time:2000, name:"Apple", locked: false} {id:102, category:544, onInit:{gold:-135}, onComplete:{energy:145}, time:2000, name:"Banana", locked: false} {id:106, category:302, onInit:{energy:-50, power: -25}, onComplete:{gold:100, diamonds:2}, time:10000, name:"Run", locked: false} {id:107, category:302, onInit:{energy:-70, silver: -55}, onComplete:{gold:100}, time:10000, name:"Dance", locked: false} {id:108, category:302, onInit:{energy:-230, power: -355}, onComplete:{gold:70, silver:70}, time:10000, name:"Fitness", locked: false} Now, I would love to add a system where I can lock/unlock the actions using achievement rules. Lets say, if you buy 10 apples, you unlock a new action, like bananas which cost more, and reward more. In the future I maybe want to restrict achievements and actions to levels. I am kinda stuck how to structure this. I have 2 questions: Which patterns are used to define achievements? How/where are they defined? Should it be part of the action, or should it be a separate controller? Is it a good idea to register all completed actions to it? I think I want multiple types of achievement rules, Id love to hear some ideas how to develop it. How do you create/find a good balance, so the user does not get stuck or can cheat by repeat a pattern of actions to get too much rewards. I know there is not a simple answer and i'm lacking of a good game-concept, but I wonder if anyone created such a game and how you dealed and played with it.

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  • How to keep your eyes on the prize?

    - by Ziv
    I'm about to go in a very intensive programming course (8AM-8PM every day of the week for three months), at the end of which I will be given a developer job-the job's quality and the project I will work on will depend on my performance in the course. Getting a good position in the company could be very beneficial and I would very much want that, does anyone have specific techniques or ways that he keeps himself concentrated on a goal for a long period of time?

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  • Keep only essential packages

    - by Stijn
    In an attempt to learn more about Ubuntu and its packages, I want to remove all non-essential packages, so I can install what I need, when I need them and know what they do. I'm using the commands dpkg --clear-selections and apt-get dselect-upgrade for this. I also slightly modify the selection by setting apt libstdc++6 (due to apt) install-info (due to grep) to install again (somehow dpkg thinks they are not essential, but apt-get complains). Is this ok, or is this bad? If it's ok, what do I do with the large list of packages with "deinstall" status in dpkg? An additional note, I'm doing this on a VPS template so I have no control over the initially installed packages.

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  • change the subdomain and keep the rest of the url

    - by MohamedKadri
    Hello, I'm working on a multilingual website, and I want to generate the links in this way: The site is domain.tld and defaults to English, It has some subdomains like fr.domain.tld which will be in French, de.domain.tld which will be in German, it.domain.tld which will be in Italian... when the current page is the index, the links to other languages will be like this: domain.tld, fr.domain.tld, de.domain.tld, it.domain.tld.... But when we are in another page like domain.tld/my-page, how do we generate the URLs to match the current page but with another subdomain/language using PHP

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  • Keep getting smbd errors, but apport asks questions I can't answer

    - by Steve Kroon
    What I want to know below is where to bug report the poor series of questions I'm being asked... Every time I reboot (at least), I get a crash dialog ("Sorry, Ubuntu 12.04 has experienced an internal error"). Clicking on show details shows the problem is with smbd, but the rest of the trace does not appear. When I wish to continue to send a bug report, I am told I will be asked a series of questions in a window titled "Apport". The first question asks: How would you best describe your setup? -I am running a Windows File Server -I am connecting to a Windows File Server. Since I am doing both, I have no idea which to choose. In any case, selecting one leads to the next question: Did this used to work properly with a previous release? -No -Yes But I never tried to use Samba in a previous release, so I can't seriously answer this. After picking an option here, I get more questions in a similar vein. Surely there should be "I don't know/I haven't tried" options, even if they simply mean you can't submit a useful bug report.

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  • Botnets Keep Spam Volume High: Google

    <b>eSecurityPlanet:</b> "Botnets cranked out more spam and larger individual files containing spam in the first quarter of this year, according to the latest report from Postini, Google's e-mail filtering and security service."

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  • Java - What methods to put in an interface and what to keep out

    - by lewicki
    I'm designing a file handler interface: public interface FileHandler { public void openFileHandler(String fileName); public void closeFileHandler(); public String readLine(); public String [] parseLine(String line); public String [] checkLine(String line[]); public void incrementLineCount(); public void incrementLineSuccessCount(); public void incrementLineErrorCount(); public int getLineCount(); public int getLineSuccessCount(); public int getLineErrorCount(); } It is soon apparent to me that these methods can't be made private. I don't want incrementLineCount to be public. What is proper way to design an interface like this?

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  • How to keep a team well-trained?

    - by PierrOz
    Hi dear fellows, I'm currently mentoring a small team of 4 junior dev in small software company. They are very smart and often achieve their tasks with a high-quality job but I'm sure they still can do better - actually I have exactly the same feeling for myself :) -. Besides some of them are more "junior" than other. So I would like to find of a funny way to improve their CS skills (design, coding, testing, algorithmic...) in addition to the experience they acquire in their daily work. For instance, I was thinking of setting up weekly sessions, not longer than 2 hours, where we could get together to work on challenging CS exercises. A bit like a coding dojo. I'm sure the team would enjoy that but is it really a good idea? Would it be efficient in a professional context? They already spend all their week to code so how should I organize that in order for them to get some benefits? Any feedback welcome !

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  • Website Maintenance to Keep your Site Going At Top

    Having a website with professional design with all other elements in place is surely good thing in itself, but unlike other things like TV, air conditioner, computers, etc websites also demand mainte... [Author: Alan Smith - Web Design and Development - June 13, 2010]

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  • How to keep background requests in sequence

    - by Jason Lewis
    I'm faced with implementing interfaces for some rather archaic systems, for handling online deposits to stored value accounts (think campus card accounts for students). Here's my dilemma: stage 1 of the process involves passing the user off to a thrid-party site for the credit card transaction, like old-school PayPal. Step two involves using a proprietary protocol for communicating with a legacy system for conducting the actual deposit. Step two requires that each transaction have a unique sequence number, and that the requests' seqnums are in order. Since we're logging each transaction in Postgres, my first thought was to take a number from a sequence in the DB, guaranteeing uniqueness. But since we're dealing with web requests that might come in near-simultaneously, and since latency with the return from the off-ste payment processor is beyond our control, there's always the chance for a race condition in the order of requests passed back to the proprietary system, and if the seqnums are out of order, the request fails silently (brilliant, right?). I thought about enqueuing the requests in Redis and using Resque workers to process them (single worker, single process, so they are processed in order), but we need to be able to give the user feedback as to whether the transaction was processed successfully, so this seems less feasible to me. I've tried to make this application handle concurrency well (as much as possible for a Ruby on Rails app), but now we're in a situation where we have to interact with a system that is designed to be single process, single threaded, and sequential. If it at least gave an "out of order" error, I could just increment (or take the next value off the sequence), but it's designed to fail silently in the event of ANY error. We are handling timeouts in a way that blocks on I/O, but since the application uses multiple workers (Unicorn), that's no guarantee. Any ideas/suggestions would be appreciated.

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  • FGLRX Drivers Keep Crashing | "Installation Media" reads Natty even though I'm in Precise

    - by Tom Thorogood
    I recently switched back to Ubuntu after a year or so of hardly touching my Ubuntu partition, and upgraded from Natty. Every time I start up, i get the "A problem has occurred..." popup, but it won't let me report it because Precise is not in beta. The details on the report show a segfault, and going through all the details, I notice that it lists Natty under "InstallationMedia" -- I just installed these drivers, so I'm really unsure why it's saying this. I wish I could copy this entire error report, but I see no way of doing that (is it stored somewhere in /var/log?). I'm new to the Unity interface (it's why I stopped using Ubuntu to begin with, but now that I'm getting used to it I'm liking it better). Thanks.

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  • 12.04 in Virtualbox is keep losing my wireless connection

    - by Derek
    I've Windows 7 as the Host OS, Ubuntu 12.04 as the guest and a Netgear WG111v2 as the USB Wireless device. Its connected to an open Wi-Fi network at work to bypass my works crazy strict filtering, When on the domain. I currently have network eth0 turned off in the virtualbox settings so the only network source would be through the USB device at wlan1. Its odd but the wireless seems extremely temperamental, I constantly have to ifconfig wlan down then ifconfig wlan1 up to get it back online. I know this might be super vague just curious if anyone has tried something like this or run into anything like it to point me in a direction I might not be seeing.

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  • Automatically keep your local git repos clean

    - by kerry
    Most developers using git are probably aware of a command ‘git gc’ that has to be run from time to time when you notice your git commands are running a little slow. This command cleans up your git repo and makes sure everything is nice and tidy. If you have not run this command lately, you will notice a huge performance increase in your git commands after running. It’s a bit annoying to have to run this command when you notice that your git performance is suffering. The command also takes a while if you have not run it recently. With this in mind, I decided to create a method to automatically run this command from time to time. So I decided to overload cd similar to how rvm does. All you have to do is paste the method in your .profile file and it will run the command every time you enter a directory with a git repo. You’ll notice a little pause when entering the directory, it’s not insufferable but if you would prefer, you can add an & to the end of the command to have it run in the background. I chose the pause over the pid output of the background command. Here it is in all it’s glory. View the code on Gist.

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  • Website Maintenance: To Keep Website Up To Date

    Just by owning a website does not ensure its smooth functioning. Proper website maintenance and development at regular interval of time keeps it going. At the launch of the website things might go on... [Author: Alan Smith - Web Design and Development - May 13, 2010]

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  • Why do i keep forgetting things? [closed]

    - by Mr.Anubis
    I am currently learning many things at the same time in C++ and coded many data structures and algorithms and some small applications. When I suddenly try to remember something that I coded many months ago, my mind completely goes blank. It's like I'll have to re-learn the whole thing. For example, recently I was thinking to refactor my BST data structure, when I realized that I don't even remember how I coded it or how does it works internally. Does this happen with many others? Or is it me only? How do I overcome this problem?

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  • Need efficient way to keep enemy from getting hit multiple times by same source

    - by TenFour04
    My game's a simple 2D one, but this probably applies to many types of scenarios. Suppose my player has a sword, or a gun that shoots a projectile that can pass through and hit multiple enemies. While the sword is swinging, there is a duration where I am checking for the sword making contact with any enemy on every frame. But once an enemy is hit by that sword, I don't want him to continue getting hit over and over as the sword follows through. (I do want the sword to continue checking whether it is hitting other enemies.) I've thought of a couple different approaches (below), but they don't seem like good ones to me. I'm looking for a way that doesn't force cross-referencing (I don't want the enemy to have to send a message back to the sword/projectile). And I'd like to avoid generating/resetting multiple array lists with every attack. Each time the sword swings it generates a unique id (maybe by just incrementing a global static long). Every enemy keeps a list of id's of swipes or projectiles that have already hit them, so the enemy knows not to get hurt by something multiple times. Downside is that every enemy may have a big list to compare to. So projectiles and sword swipes would have to broadcast their end-of-life to all enemies and cause a search and remove on every enemy's array list. Seems kind of slow. Each sword swipe or projectile keeps its own list of enemies that it has already hit so it knows not to apply damage. Downsides: Have to generate a new list (probably pull from a pool and clear one) every time a sword is swung or a projectile shot. Also, this breaks down modularity, because now the sword has to send a message to the enemy, and the enemy has to send a message back to the sword. Seems to me that two-way streets like this are a great way to create very difficult-to-find bugs.

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  • Best way to move your domain and keep the Google position

    - by netadictos
    I have to move one domain to a new one which is semantically better for SEO. I would like to know the best way to do it so that the new domain keeps the google position. I know the basic steps: to put a redirection 301 in the old one, with an apache script, it can be very detailed, but the important is the 301 header for google you can tell them through the webmaster tools page try to gain pagerank for the new domain

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  • Keep Your System Clean with BleachBit

    <b>Linux Pro Magazine:</b> "Keeping your system clean can be a time-consuming affair, unless you use specialized tools like BleachBit (thanks to Nick Lord for the pointer). With just a few mouse clicks, this nifty little utility can help you to purge all the junk produced by the system and installed applications."

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  • Keep Your Business Fresh With a Dynamic Website

    Every one likes freshness in every aspect of life. It is even more important when we talk about website. Internet users like to see constant changes and new content on the website. So if you have dynamic web site, you are with a great chance to success online.

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