Lord Palmerston on Programming
There was a time when if you read one book by Peter Norton, you literally knew everything there was to know about programming the IBM-PC. Over the last 20 years, programmers around the world have been hard at work building abstraction upon abstraction on top of the IBM-PC to make it easier to program and more powerful.
But the law of leaky abstractions means that even as they built the abstractions that are supposed to make programming easier, the sheer amount of stuff you have to know to be a great programmer is expanding all the time.
Becoming proficient, really proficient, in just one programming world takes years. Sure, lots of bright teenagers learn Delphi one week and Python the next week and Perl the next week and think they are proficient. Yet they don’t have the foggiest clue how much they’re missing.
I’ve been working with ASP and VBScript since it first came out. VBScript is the dinkiest language on earth and ASP programming consists of learning about 5 classes, only two of which you use very often. And only now do I finally feel like I know the best way to architect an ASP/VBScript application. I finally think I know where the best place to put database access code is, the best way to use ADO to get recordsets, the best way to separate HTML and code, etc. And I finally use regexps instead of one-off string manipulation functions. Only last week, I learned how to get COM objects out of memory so you can recompile them (without restarting the whole web server).
Fog Creek is too small to have specialists, so when I needed to write a really good installer for FogBUGZ, our ASP/VBScript based product, I drew on several years of C++/MFC experience, and years of experience with Windows APIs, and good Corel Photopaint skills to create a neat picture in the corner of the wizard. Then to get FogBUGZ to work perfectly with Unicode, I had to write a little ActiveX control using C++ and ATL, which drew upon years of C++ and COM experience and a week or so learning about character encodings when I implemented that code in CityDesk.
So when we had a weird NT 4.0-only bug, it took me 3 minutes to debug, because I knew how to use VMWare, and I had a clean NT 4.0 machine set up in VMWare, and I knew how to do remote debugging with Visual C++, and I knew to look in the EAX register to get the return value from a function. Someone who was new to this all might have taken an hour or more to debug the same problem, but I already knew a tremendous amount of “stuff” that I’ve been learning, basically, since 1982 when I got my first IBM-PC and that Norton book.
Leaky abstractions mean that we live with a hockey stick learning curve: you can learn 90% of what you use day by day with a week of learning. But the other 10% might take you a couple of years catching up. That’s where the really experienced programmers will shine over the people who say “whatever you want me to do, I can just pick up the book and learn how to do it.” If you’re building a team, it’s OK to have a lot of less experienced programmers cranking out big blocks of code using the abstract tools, but the team is not going to work if you don’t have some really experienced members to do the really hard stuff.
There are a lot of programming worlds, each of which requires a tremendous amount of knowledge for real proficiency. Here are the three I personally know best:
· MFC/C++/Windows
· VBScript/ASP
· Visual Basic
All, basically, what you would call Windows programming. Yes, I’ve written Unix code and Java code, but not very much. My proficiency in Windows programming comes from knowing not just the basic technologies but also the whole supporting infrastructure. So, I claim, I’m really good at Windows programming because I also know COM, ATL, C++, 80x86 Assembler, Windows APIs, IDispatch (OLE Automation), HTML, the DOM, the Internet Explorer object model, Windows NT and Windows 95 internals, LAN Manager and NT networking, including security (ACEs, ACLs, and all that stuff), SQL and SQL Server, Jet and Access, 3-6638.php" class="back_link">⇐ Назад