Owlscript

With Lexical scoping, dynamic typing, first class functions, recursion, lambdas, and built in lists, you'd be forgiven for assuming OwlScript is yet another lisp, a peak "under the hood" will tell you that it was actually perl that was the greater influence on OwlScript. Now that half of you have run for the hills, lets talk about what OwlScript can do!

Owlscript has a terse grammar, where variables are declared by use - no 'let' or 'var' keywords. 'if' and 'loop' statements allow for easy control flow of Owlscript programs.

def fib(m) {
    if (m < 2) {
        return 1;
    } 
    return fib(m-1) + fib(m-2);
}
i := 1;
loop (i < 14) {
    print fib(i);
    i := i + 1;
}

Lists are a built in data type in owlscript, with indexed access which mimics array like behavior. the length of a list is returned through the built-in function 'length()'

i := [13, 42, "yo dag", 6.66, 341];
m := 0;
loop (m < length(i)) {
    print (i[m] + " ");
    m := m + 1;
}
print "\n";

You can also print a list all at once instead of iterating through as above simply by using the print and println statement:

heroes := ["batman", "superman", "snoop dogg", "emmanual west"];
println heros;

Aside from indexed access, OwlScript also supports push/pop for use like a stack and append/pop for use as a queue.

villains := [];
push(villains, "joker");
append(villains, "lex luther");
push("sponge bob");
#whoops
pop(villains);

If your other car is a cdr, or you just prefer speaking with a bit of a lisp, OwlScript has some other familiar primitives as well:

list := [13, 42, 86, 37, 24, 11];
println list;
i := 0;
tail := list;
loop (i < length(list)) {
    println i + ": " + first(tail);
    tail := rest(tail);
    i := i + 1;
}
print "\n";
println list;