> > > >---- Original Message ---- >From: dburr...@debian.org >To: debian-user@lists.debian.org >Subject: Re: Which programming Language >Date: Mon, 9 Feb 2009 20:19:59 -0800 > >> I think one important thing is to learn more than one language. >There >>are a couple reasons for this, but if I had to give you just one, >here >>is what it would be: >> >> In most languages I know, there are certain programming techniques >>that are considered "difficult", "advanced" or "black magic". There >>are other techniques which are considered "easy", and are usually >taught >>to beginners. What's interesting is that these techniques are not >the >>same in each language. In fact, techniques that are considered >>"advanced" in one language are very often "easy" in another! >> >> Why is this? In my opinion, it's not that you have to be smarter >to >>write code in, say, Haskell than in C++. It's that some techniques >that >>are directly supported by the most basic language constructs in >Haskell >>require the sophisticated use of multiple obscure language features >to >>achieve in C++. So they get the reputation of being "hard" because >when >>most people learn them, they're learning the obscure language >features >>and trying to grasp the sophisticated implementation details at the >>same time they're trying to learn the concepts behind the technique. > I >>don't mean to pick on C++ here: the same thing is true the other way >>around. (the code for DiffArray is utterly hair-raising, for >instance) >>I also think that programmers who have learned these techniques in a >>language where they're "hard" sometimes have trouble separating the >many >>implementation details from the technique itself. That can make it >hard >>for them to implement a slightly modified version of the technique, >or >>to recognize someone else's implementation when they run into it. >> >> If you've seen the basic idea in another language, it's a lot >easier >>to focus on the details of how to get it done in another language, >and >>it's easier to know when to deploy it (you might not know exactly >how >>to do it yet, but at least you know that it will solve the problem >in >>front of you). It's basically about getting more "tools" in your >>mental toolbox, so you don't end up trying to drive screws with a >>hammer. :-) >> >> I was avoiding naming particular techniques here, but for >instance, a >>lot of C++ programmers avoid templates -- functions that can operate >on >>more than one type -- because they're considered "too hard". In >>Haskell, *every* function can operate on multiple types; there's no >>special syntax required to do it. >> Conversely, a lot of sophisticated C++ code relies on making use >of >>"side effects": functions that, instead of computing something, >modify >>some pseudo-global variable. Haskell eliminates the routine use of >side >>effects, but there are some approaches to problems that are much >easier >>to understand in terms of side effects, even if your final >>implementation doesn't use them. >> >> >> I would advocate learning two languages early on: a lot of people >>invest much time and effort in just one, and then find it too >difficult >>to learn a second. I'm not sure why this is, but my theory is that >it's >>some combination of: >> >> (a) "baking in" a concept of how you conceive of a computer >program, >> so that it's hard to become accustomed to / pick up a new >> language. >> >> (b) the fact that when you start learning a new language, you >start >> as a beginner (or almost a beginner), which can be a >frustrating >> experience for someone who was an expert in the language they >> were using before. I imagine it must be like going back to >grade >> school to study arithmetic again. >> >> For the particular languages, I would advocate >> >> (1) a traditional imperative language such as Java, C#, Python, >C++ >> PHP, Fortran, Ada, PL/1 ;-) etc. These are all more or less >the >> same (modulo memory management, see below) and they're what >> you'll actually use for practical programming and if you >want to >> get a paying job. (we wouldn't call it "work" if it was >> fun. :-) ) >> >> and at least one of >> >> (2) a Lisp descendant such as Scheme or Common Lisp. Scheme is >> perhaps easier to learn; Common Lisp seems to have more >"stuff" >> to get stuff done (although IIRC, drscheme/mzscheme has a >pretty >> good environment and set of libraries). Lisp has some >> "interestingly different" ideas about how a programming >language >> can be designed, like its powerful macros, and although it >looks >> funny, it's actually not that different from >> >> (3) one of the strongly typed "functional" languages, like >O'Caml >> (an ML descendant) or Haskell. These are good for learning >a >> lot of techniques >> >> I might also through Erlang in there -- from what I've heard it's >a >>good introduction to concurrent programming. Sadly I haven't had >time >>to learn it myself. :-( >> >> Also: if you want to become a really expert computer programmer, >you >>really MUST become proficient in C or C++ at some point. (and when >I >>say C++, I mean "C with objects", not "insane template library >hiding >>everything in the computer from you", despite my love of such >template >>libraries) They are still the only games in town when it comes to >>getting a handle on what's going on underneath all the other >language >>implementations, and if you know that stuff, there are all sorts of >>problems you can tackle that someone whose knowledge stops at the >>implementation boundary won't be able to touch. >> >> However, these two languages also require you to ask the system >for >>memory when you need to store some data, and to give it back when >>you're done. It might be surprising, but this turns out to be >rather >>difficult -- in fact, until you become quite skilled with the >language, >>most of the bugs you write will be related to memory management. >And >>TBH, I think the main "skill" C/C++ programmers learn around memory >>management is how to avoid writing programs in which memory >management >>is difficult. :-) However, it's useful to have some understanding >of >>how this works, because memory handling can cause problems for you >in >>higher level languages if you don't understand how it works. And, >of >>course, because then you can do stuff that requires working in a >>language with manual allocation (for whatever reason). >> >> Daniel >> >> I think I'd add one more to this excellect dialog. For some Engineers (particularly Electrical) that need to know how the CPU functions, Assembler is essential. IMHO there is no better way to understand the workings of a processor than to slog through some assembly programs line by line. Larry >>-- >>To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org >>with a subject of "unsubscribe". Trouble? Contact listmas...@lists.d >ebian.org >> >> >>
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