Re: a functional programming library

[Andrew Wilson <agrwagrw@...>]

In sample code provided something seems wrong with sum function?

> lfunc = dofile('lua-functional.lua')  -- load all functions into the table
> lfunc
> lfunc.loadglobally(lfunc)  -- now all functions are in the global namespace
> -- first line generates a list of fibonnacci numbers below 100
> fibs = gent({1,2}, function(t,ind) return t[ind-1]+t[ind-2] end,
> function(t,ind) return geq(ind,100) end)
> odd = compose(apply(eq,1),applyn(mod,2,2))
> list = listcomp(function(x) return x*x end, fibs, odd)
> sum = apply(foldl1,add)

lua: lua-functional.lua:273: attempt to call local 'iter' (a number value)
stack traceback:
	lua-functional.lua:273: in function <lua-functional.lua:267>
	(tail call): ?
	lua-functional-fact.lua:10: in main chunk
	[C]: ?
>Exit code: 1



On Fri, Sep 30, 2011 at 11:27 AM, Bo Waggoner <luafunctional@gmail.com> wrote:
> Hi all, this is my first time posting to the mailing list!
> I've created and posted a functional programming library, which you can
> download here:
> https://bitbucket.org/luafunctional/lua-functional
> This was mainly just something I did for fun and because I really enjoy both
> FP and Lua, and I hope it might be useful! I know there are some other
> similar resources, so here's some of the attributes of this one:
> Pros:
> -pretty big set of functions: map, zips, folds, filters, list comprehension,
> ranges, currying, scans, and mini helper functions.
> -documentation
> -somewhat well tested (has a test suite)
> -"plug and play" (see example below) -- not a module (or maybe this is a
> con?)
> Cons:
> -performance not benchmarked/known
> I would love any feedback! The source is completely free, so it would be
> great if anyone wants to incorporate these functions or the library into a
> different project or library as well.
> Here's an example (sum the squares of the odd fibonnacci numbers under 100):
> lfunc = dofile('lua-functional.lua')  -- load all functions into the table
> lfunc
> lfunc.loadglobally(lfunc)  -- now all functions are in the global namespace
> -- first line generates a list of fibonnacci numbers below 100
> fibs = gent({1,2}, function(t,ind) return t[ind-1]+t[ind-2] end,
> function(t,ind) return geq(ind,100) end)
> odd = compose(apply(eq,1),applyn(mod,2,2))
> list = listcomp(function(x) return x*x end, fibs, odd)
> sum = apply(foldl1,add)
> print(sum(list))
>
> Thanks everyone! Again, feedback would be awesome!
> Bo