A Lua utility-belt library for functional programming.

How can I get the sum of all integers between 1 and 100 ?

local sum = M.sum(M.range(100))
print(sum) -- 5050

Say I am looking for the length of the longest word in some array ?

local words = {'some','words','of','different','lengths'}
print(M.max(words, M.op.length)) -- 9 letters

What is the sum of all fibonacci numbers for n below or equal 25 ?

local function fib(n) return n < 2 and n or fib(n - 1) + fib(n - 2) end
local fibsum = M.sum(M.map(M.range(25), fib))
print(fibsum) -- 196417

Or let us do the same, object-oriented style with chaining :

local function fib(n) return n < 2 and n or fib(n - 1) + fib(n - 2) end
local fibsum = M.chain(M.range(25)):map(fib):sum():value()
print(fibsum) -- 196417

Or even shorter :

local fibsum = M(M.range(25)):map(fib):sum():value()
print(fibsum) -- 196417

Feel free to download and try it on your own!

• 2.1.0 (latest stable): zip | tar.gz
• Previous versions : tags

git clone git://github.com/Yonaba/Moses.git

luarocks install moses

moonrocks install moses

local M = require "moses"

Note: the full source moses.lua is quite heavy (~92 kiB, 3115 LOC). You can alternatively use the minified version (~35 kiB, 561 LOC).

Find a complete set of code examples in tutorial.md.

• Read it online.

• Jeremy Ashkenas, for the amazing Underscore.js
• Marcus Irven's and JT Archie's 1-to-1 ports that also inspired this
• Matthew Rocklin's Toolz from which I borrowed some ideas
• Steve Donovan's LDoc, used to generate the current HTML documentation.
• Mark Langen's LuaMinify, used to generate a minified version of this library.

Run spec tests from Lua using busted with the following command from the root folder:

busted

This work is under MIT-LICENSE
Copyright (c) 2012-2018 Roland Yonaba.
See LICENSE.