newLISP is a modern dialect of Lisp, designed by Lutz Mueller to be (as he says himself) "quick to learn and to get the job done". I must say that this sentence couldn't be more true - solving Euler Problem 10 (finding the sum of all primes below 2 million) after just two days of fiddling with newLISP took me less than 3 minutes, including designing, writing, testing and executing the following code:
(println (apply + (filter (fn (n) (= 1 (length (factor n)))) (sequence 2 2000000))))In spite of being an interpreted language, programs created with newLISP run amazingly fast. The code above is a purely brute force solution, yet it executes in less than 10 seconds on Core 2 Duo 1.66GHz.
However, simplicity comes for a price. If you try to use a more sophisticated approach, like classic sieve of Eratosthenes, you might get a bit surprised:
(define (sieve seq out) (let ((n (first seq))) (setf seq (filter (fn (x) (!= 0 (mod x n))) seq)) (push n out) (if (not seq) out (sieve seq out)))) (print (apply + (sieve (sequence 2 2000000))))In this code function sieve, although properly tail recursive, will make newLISP to quickly run out of stack or (if you provide enough space for the stack) of all available memory. It's because newLISP does no tail recursion optimization. If for some reason you cannot live with it, you can still use Common Lisp for implementing such recursions:
(defun range (min max) (loop for i from min to max collect i)) (defun sieve (seq &optional out) (let ((n (car seq))) (setf seq (delete-if #'(lambda (x) (= 0 (mod x n))) seq)) (push n out) (if (not seq) out (sieve seq out)))) (print (apply #'+ (sieve (range 2 2000000))))As you can see, the code of function sieve is very similar, so it's fairly easy to switch to newLISP if you already have some Common Lisp background. Differences to other Lisp dialects are well documented, as well as the language itself. Documentation is another strength of newLISP: you can learn how to solve different real life problems using newLISP code patterns or browse through many interesting code snippets.
What I personally like about newLISP in comparison to other Lisps is its really tiny footprint. You can create a standalone executable containing an embedded newLISP engine which is 200kB small, using two simple steps:
(load "/usr/share/newlisp/util/link.lsp") (link "/usr/bin/newlisp" "mycode.bin" "mycode.lsp")Despite being so small, newLISP provides a surprising amount of functionalities out of the box: regular expressions, TCP/IP networking (including FTP and HTTP protocols), database access (through external libraries), OpenGL, XML and XML-RPC handling, matrices, statistics (including Bayesian formulas), unicode support and a set of C/C++ modules that extend its abilities even more.
newLISP also supports parallel processing through Cilk-like API, and distributed computing through a built-in function net-eval.
newLISP is definitely not a New Common Lisp, and in some points (such as the beforementioned tail recursion) is still inferior. But newLISP is a perfect example that in the IT industry sometimes worse is better.