Hi folks, I've got an interesting task this week for my job. (Note that this will undoubtably last for longer than a week). I'm evaluating several high-level languages as development vehicles for our next suite of applications. The languages I'm currently considering are Scheme, Erlang, and Haskell. Scheme and Haskell have fairly wide acceptance in their particular roles (Scheme as the "pretty" lisp, supporting higher-order functions and mostly strict [until you roll your own laziness with macros], and Haskell the absolute purest language with no side effects and fully lazy evaluation). Erlang has a really nice distributed computing model, and has a nice union of non- and side-effect qualities (although it's completely strict). The toy application I've "designed" for myself is a simple GUI-based app that can load a Sun .au format sound file, display its waveform in a window, perform some simple filtering, play the sound for the user, and then save the changed sound file back out to disk. If I get familiar enough with the respective environments I'd like to add zooming in/out and scrolling to the waveform display. This application should allow me to see all kinds of different characteristics of the language/implementation, such as performance (how fast can the filter run), I/O (how fast can I load/save data to disk), OS interaction (how easy can I "play" the audio), user acceptance (how easy is it to do GUI programming) and of course the software engineering goals of modularity, correctness, and simplicity. The end goal is for me to have three working programs, in three different languages, so that I can present to my boss the performance/software engineering characteristics of each system to choose our next development language. So I'm writing you to solicit help. I have an amortized four days (32 hours!!!) to implement this simple application in Haskell. Can anyone point me to example code, supporting libraries, tutorials, etc. that are in this area of development? If I have to dumb down some of my application in order to make a great discovery about a language, that's fine. I'm expecting some great differences between these three programs. Any advice/pointers/flames welcome. Thanks in advance. Mike -- Mike J. Bell This is all just my opinion. "Outside of a dog, a book is man's best friend. Inside it's too dark to read." mikeb@manor.org