Lua Fun is a high-performance functional programming library designed for LuaJIT tracing just-in-time compiler.
The library provides a set of more than 50 programming primitives typically
found in languages like Standard ML, Haskell, Erlang, JavaScript, Python and
even Lisp. High-order functions such as map, filter, reduce, zip
will help you to write simple and efficient functional code.
Let's see an example:
> require "fun" ()
> n = 100
> reduce(operator.add, 0, map(function(x) return x^2 end, range(n)))
> -- calculate sum(x for x^2 in 1..n)
328350
Lua Fun takes full advantage of the innovative tracing JIT compiler
to achieve transcendental performance on nested functional expressions.
Functional compositions and high-order functions can be translated into
efficient machine code. Can you believe it? Just try to run the example
above with luajit -jdump and see what happens:
-- skip some initilization code --
->LOOP:
0bcaffd0 movaps xmm5, xmm7
0bcaffd3 movaps xmm7, xmm1
0bcaffd6 addsd xmm7, xmm5
0bcaffda ucomisd xmm7, xmm0
0bcaffde jnb 0x0bca0024 ->5
0bcaffe4 movaps xmm5, xmm7
0bcaffe7 mulsd xmm5, xmm5
0bcaffeb addsd xmm6, xmm5
0bcaffef jmp 0x0bcaffd0 ->LOOP
---- TRACE 1 stop -> loop
The functional chain above was translated by LuaJIT to (!) one machine loop containing just 10 CPU assembly instructions without CALL. Unbelievable!
Readable? Efficient? Can your Python/Ruby/V8 do better?
Lua Fun is in an early alpha stage. The library fully [documented] Documentation and covered with unit tests.
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LuaJIT 2.1 alpha is recommended. The library designed in mind of fact that LuaJIT traces tail-, up- and down-recursion and has a lot of byte code optimizations. Reference Lua may not work and is not supported.
Please check out documentation for more information.
Lua Fun is distributed under the MIT/X11 License - (same as Lua and LuaJIT).
The library was written to use with Tarantool - an efficient in-memory store and an asynchronous Lua application server.
Please "Like" the project on GitHub to help it to survive! Thanks!
Lua Fun. Simple, Efficient and Functional. In Lua. With JIT.
