I would suspect, bladx, that you (like me) know a number of what I call C-type languages. Languages that are in the model of C and either are simpler or more complex that it, but use it as a base. Pascal, VB, Perl, Java, Javascript, C++, etc. Of there, Perl and C are the clear winners. Perl is for development speed and C is for execution speed and memory usage. (I'd use a C++ compiler to make C strongly-typed, but that's a personal preference.)

However, Having taken a (very) quick look at LISP and Prolog, for example, those are completely different languages from C, requiring a completely different paradigm. Not having a lot of experience in either, I wouldn't be able to say how their execution/memory usage compares, but I suspect that, for certain applications, it's very favorable.

Somewhere on PM, someone posted the four basic paradigms of programming languages. They roughly correlate to four different ways of tackling a given problem. I wonder if someone could bring that back up?

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