Starting In Lua

Hello, I've been interested in learning how to program in Lua because I want to make Roblox games for fun and also get a sense of what programming is about. So I'm here to ask: how did you start learning? Is there any free online program that's worth it? Your experiences and advice would be a lot of help.


Thank you!

https://redd.it/1p7kgs4
@r_lua

Writing compact code - how do I check for multiple possibilities all at once in the shortest statement possible?

I'm a relative newbie to Lua and I'm curious about ways to very compactly write a check for multiple possible values. Consider the following code:

if value ~= "a" and value ~= "b" and value ~= "c" then

Obviously functional for an if statement, but I want to know if there's a less repetitious way to write it. Does Lua have any tricks for making this more compact? If so, could these tricks be scaled up for checking large numbers of possible values all at once?

https://redd.it/1p7msep
@r_lua

Can you tell me a website where you can learn luau completely



https://redd.it/1p81tro
@r_lua

Problem with CS50 games Mario and workaround

https://redd.it/1p8cuo5
@r_lua

Convert C header file to more machine-readable format?

Is anybody aware of a standard for specifying the API of an object file (lib.so) besides a C header file (.h file)?

I'm designing my own assembly language and want to consume and link headers to link with dynamic libraries produced by C. It would be nice to not need to implement my own C compiler to do so.

https://redd.it/1p8it8l
@r_lua

Can someone tell me why this code doesn't work

Simply trying to iterate through a table, and nothing is printed out, why?

local myTable = {}

local myStruct = {}
myStruct.myValue = 5
myStruct.myOtherValue = "Bears"

myTable"Joe" = myStruct
myTable"Suzy" = myStruct

for name, struct in pairs(myTable) do
print("myValue= " .. struct.myValue.. ", myOtherValue = " .. struct.myOtherValue .. "\n")
end

https://redd.it/1p8n16f
@r_lua

It is possible to make a desktop app with lua?

I'm trying to work on a project of desktop app fully on lua but I struggle to find something out of love2D (I'm not sure it's the most adapted for the project but that is currently my backup option) to make the graphical interface.

Do you have any recommendations?

https://redd.it/1p8qi58
@r_lua

Need help with a discontinued balatro mod

Firstly I can pay you up to $25... In robux, I have no digital bank account so I'm limited to that if you want money for that.


If your interested "money"wise or not, I want whoever is interested to do a couple things. 1. The balatro mod has a library, a compact to work with another dependent mod. and the mod itself, I would like all of them combined. 2. I would also like it updated to the latest Smod + Lovely. If your still interested in that, feel free to tell.

https://redd.it/1p9d0kc
@r_lua

Looking for feedback on simple Love2D program - how to cleanly write this code?

I'm learning the LÖVE framework and having a good time covering the basics. I've currently made a little program that shows a series of text, one word at a time, while bouncing around the screen like a screensaver from the 90's. So far, it works, but I'm looking for ways to make the code nicer and avoid developing bad habits.

The code uses the [tick](https://github.com/rxi/tick) library to do changes every second. This also uses a separate "words" file that holds the full text in a table, word by word (in this case, the Gettysburg address, but any list of words will do). Here's the full main file:

function love.load()


--load the library
tick = require "tick"


--import the speech
require "words"


--start the count
word_count = 1


-- cycling function
function cycle_word()
if word_count == #speech then
word_count = 1
else
word_count = word_count + 1
end
end


font = love.graphics.getFont()


--define y edges
y_stopper = love.graphics.getHeight() - font:getHeight()
--x edge is conditional


--define position
x_coord = 0
y_coord = 0


-- start random generator
math.randomseed( os.time() )


--testing a dummy variable to make it truly random
_dummy = math.random()


--define angle
angle = math.random(10,80) * math.pi / 180


x_speed = 100 * math.sin(angle)
y_speed = 100 * math.cos(angle)


x_switch = 1
y_switch = 1


-- cycle the function
tick.recur(cycle_word , 1)
end


function love.update(dt)
tick.update(dt)


-- define x edge
x_stopper = love.graphics.getWidth() - font:getWidth(speech[word_count])

if x_switch == 1 and x_coord + x_switch*x_speed*dt > x_stopper then
x_switch = -1
end
if x_switch == -1 and x_coord + x_switch*x_speed*dt < 0 then
x_switch = 1
end


if y_switch == 1 and y_coord + y_switch*y_speed*dt > y_stopper then
y_switch = -1
end
if y_switch == -1 and y_coord + y_switch*y_speed*dt < 0 then
y_switch = 1
end


x_coord = x_coord + x_switch*x_speed*dt
y_coord = y_coord + y_switch*y_speed*dt
end


function love.draw()


love.graphics.print(speech[word_count], x_coord, y_coord)


end

function love.load()


--load the library
tick = require "tick"


--import the speech
require "words"


--start the count
word_count = 1


-- cycling function
function cycle_word()
if word_count == #speech then
word_count = 1
else
word_count = word_count + 1
end
end


font = love.graphics.getFont()


--define y edges
y_stopper = love.graphics.getHeight() - font:getHeight()
--x edge is conditional


--define position
x_coord = 0
y_coord = 0


-- start random generator
math.randomseed( os.time() )


--testing a dummy variable to make it truly random
_dummy = math.random()


--define angle
angle = math.random(10,80) * math.pi / 180


x_speed = 100 * math.sin(angle)
y_speed = 100 * math.cos(angle)


x_switch = 1
y_switch = 1


-- cycle the function
tick.recur(cycle_word , 1)
end


function love.update(dt)
tick.update(dt)


-- define x edge
x_stopper = love.graphics.getWidth()

- font:getWidth(speech[word_count])

if x_switch == 1 and x_coord + x_switch*x_speed*dt > x_stopper then
x_switch = -1
end
if x_switch == -1 and x_coord + x_switch*x_speed*dt < 0 then
x_switch = 1
end


if y_switch == 1 and y_coord + y_switch*y_speed*dt > y_stopper then
y_switch = -1
end
if y_switch == -1 and y_coord + y_switch*y_speed*dt < 0 then
y_switch = 1
end


x_coord = x_coord + x_switch*x_speed*dt
y_coord = y_coord + y_switch*y_speed*dt
end


function love.draw()


love.graphics.print(speech[word_count], x_coord, y_coord)


end


You will notice that it has some apparently repetitive stuff with the random seed for the angle. For some reason, when I tried to do just `math.random` for the angle, it came out as the same angle every time. So, I tried creating a disposable variable for the first random value and then using the second random variable to define the angle of the moving word. This works, but I'd like to know if there's a way to avoid taking this silly step.

So, what do you think? What could be improved?

https://redd.it/1p9tvsr
@r_lua

Leadwerks 5 Launch Party - Live developer chat
https://youtu.be/-DACZW5cyB0?si=z2JqsEs7drU01WY6

https://redd.it/1pa3u4x
@r_lua

Currying, partial application, composition and other FP thingies
https://redd.it/1pa3oqs
@r_lua

(Japanese Article, Advent Calendar, Overview) - [luarrow] Using pipe operators and Haskell-like function composition operators in Lua [Lua]
https://redd.it/1paz4e4
@r_lua

Si quereis aprender luau entrar en:

https://luau-learn-8e7def24.base44.app/home

https://redd.it/1pbc6ph
@r_lua

Help with a logitech ghub noscript

I want to make a noscript that have mouse movement when I click mouse button 4 then has extra movement when I click it while holding rmb. I don't really know how to code so I came here for help. The mouse button 4 works just fine but the right mouse button click doesn't change the movement at all. I was wondering if anyone who knew how to code for logitech ghub could help fix this code.


MoveAmount = -628

ExtraMoveAmount = -12000

function OnEvent(event, arg)

if event == "PROFILE_ACTIVATED" then

EnablePrimaryMouseButtonEvents(true)

elseif event == "PROFILE_DEACTIVATED" then

ReleaseMouseButton(4)

end

if event == "MOUSE_BUTTON_PRESSED" and arg == 4 then

local amount = MoveAmount

if IsMouseButtonPressed(2) then

amount = ExtraMoveAmount

end

for i = 1, 10 do

MoveMouseRelative(amount, 0)

Sleep(5)

end

end

end

https://redd.it/1pbrh3u
@r_lua

LuajitOS - A Nearly Full Lua Operating System

Hi, I have made an operating system called LuajitOS, most of it is written in lua so I thought it might be of interest to this subreddit.

It has its own desktop environment and can be completely customized, for example the task bar and the backgrounds are just normal programs that can be replaced. The whole app ecosystem will be in lua, this allows you to remix apps written by other people. Each application runs in it's own sandbox and can request permissions to call OS functions through either an embedded manifest as a comment at the top of the file or as a manifest.lua in the packaged application.

It comes with:
- text editor
- paint program
- shell
- browser (only local html files ATM)
- a calculator
- cryptography tool
- application manager

I'm aware someone else has made something similar before but i this is totally separate.

It's available as an ISO or as source code at luajitos.com and there is also a demo video for those who don't want to download

It's currently has no license because I'm still deciding which one.

https://redd.it/1pc191y
@r_lua

LuaJIT Array optmization

GitHub Copilot told me that defining an array as:

t = {
[1] = val1,
[2] = val2, ...
}

will signal Lua / LuaJIT to understand it as a hash table only, due to use of square brackets, even if lua array integrity were respected. It said that to allow array optimization, one must define array implicitly t = {val1, val2, ...}

But Copilot also admitted that defining an empty table first and looping values into it like: ... do t1[i] = t2[i] end OR: do t1[#t1 + 1] = v end would make it realize and optimize as a real array under the hood, even though it also uses square bracket assignments (but on an already created table, which is the only difference to above example, where values are added into a not yet created table).

However, i then asked the same question Gemini, and it said the Copilot was wrong. In the first example of explicit creation Lua / LuaJIT will correctly identify it as an array and optimize for it. It only cares whether lua array integrity is respected.


Who is right?

https://redd.it/1pc62yx
@r_lua

lnko - dotfile linker written in Lua
https://redd.it/1pcg8bd
@r_lua