How does Moses compare to Lua Fun? about moses HOT 6 OPEN

Lazy evaluation has nothing to do with Luajit. Lazy libraries just do much less iterations than non-lazy versions and that's the reason why they are so much faster. In my quick test luafun is 6667 times faster than moses using PUC Lua.

-- fn-test.lua
local _ = require "moses" -- https://github.com/Yonaba/Moses/blob/master/doc/tutorial.md
local fn = require "fun" -- https://github.com/rtsisyk/luafun

local arr = {}
math.randomseed(os.time())
for i = 1, 10^6 do
  local rand = math.random(1, 100)
  arr[i] = {rand = rand, str = string.rep("x", rand)}
end

local function filterFn(rec)
  return rec.rand % 2 == 0
end
local function mapFn(rec)
  return rec.rand + 0.1
end

local time1 = os.clock()
local gen1 = fn.iter(arr):filter(filterFn):map(mapFn):take(3):totable()
time1 = os.clock() - time1
print(string.format('%.6f seconds: %s', time1, table.concat(gen1, ', ')))
local time2 = os.clock()
local gen2 = _(arr):filter(filterFn):map(mapFn):take(3):value()
time2 = os.clock() - time2
print(string.format('%.6f seconds: %s', time2, table.concat(gen2, ', ')))
print(string.format("time1: %.6f / time2: %.6f, luafun is %.0f times faster than moses", time1, time2, time2/time1))

Luajit 2.1:
0.000028 seconds: 48.1, 72.1, 52.1
0.104055 seconds: 48.1, 72.1, 52.1
time1: 0.000028 / time2: 0.104055, luafun is 3716 times faster than moses

PUC Lua 5.1:
0.000058 seconds: 90.1, 38.1, 78.1
0.386687 seconds: 90.1, 38.1, 78.1
time1: 0.000058 / time2: 0.386687, luafun is 6667 times faster than moses

from moses.

This project is alive and Luafun is dead, but Moses does not do things in lazy way. Performance difference is huge, so I continue to use Luafun that works great.

But I wish that code could be borrowed from Luafun. Some performance tests here: #58

from moses.

Lua Fun was specifically designed to take advantage of the JIT in LuaJIT. I am not able to take advantage of the LuaJIT in my project as I am using the golang fork of Lua runtime. That means Lua Fun does not make sense for me.

from moses.

wrong way bench. it dont make sense.

from moses.

wrong way bench. it dont make sense.

@denisdemaisbr Hi, can you explain why bench is wrong? Or can you give better bench? Thanks.

from moses.

afaict I think the main difference is that moses always creates intermediate tables, but luafun mainly works with iterators themselves?

from moses.