How to learn Lua

How to learn lua? i wanna learn it for roblox because i wanna make a game and i hope i success with that
if anyone can help i will be appreciated :)

https://redd.it/1i3qizq
@r_lua

Como colocar dierentes consequências em uma mesma condição (if) quando programo em lua?

Olá! Estou fazendo o que posso para aprender a programar usando lua. Nunca programei antes, mas espero que consiga adicionar essa habilidade ao meu portifólio de ferramentas, e quem sabe até fazer um joguinho no roblox com ela.

Enquanto fazia um código para praticar, me deparei com um problema: não consegui escrever várias consequências para um só if. Isso fez com que eu tivesse de extender um parágrafo a três. Isso foi feito para ser assim ou há alguma maneira de fazer em um só parágrafo?

if EFT == true then

HP = HP + 20

elseif TLT == true then

HP = HP + 5

elseif EFT == true if TLT == true then

HP = HP + 25

end

if EFT == true then

TTpoints = 10

elseif TLT == true then

TTpoints = 5

elseif EFT == true and TLT == true then

TTpoints = 10

end

if EFT == true then

XPproductionVR = 2

elseif TLT == true then

XPproductionVR = 8

elseif EFT == true and TLT == true then

XPproductionVR = 4

end

https://redd.it/1i403nr
@r_lua

Bug in Lua (Vsc)

https://redd.it/1i41xv1
@r_lua

How do I call a recursive function multiple times?

```
local pair = function(n)

return n * 2, math.floor(n / 3)

end



local get_id = function(n)

local r = {}



r.rec = function(n)

local a, b = pair(n)



if a == n or b == n then

return "reached" -- I will do stuff here once I figure out the problem

else

tree.rec(a)

tree.rec(b)

end

end



return tree.rec(1)

end



print(get_id(20))
```

I am trying to make a function that will recursively climb up the collatz conjecture tree checking every value for the number I entered "20". Basically, I want this to assign a unique number to every collatz tree number. My problem is that tree.rec(a) is always being called first and tree.rec(b) is never called in the function.

https://redd.it/1i4441m
@r_lua

OOP "static" functions – terminological confusion?

Hello! I dive into the world of going OOP in Lua.

I understand most about .__index, metatables, prototypes etc.

My question is methodological though about content of certain guides.

Many online guides to OOP (like this one) talk about "static" functions. However, if you have a class

-- Create the table for the class definition
local ExampleClass = {}
ExampleClass.index = ExampleClass

function ExampleClass.new(name)
local self = setmetatable({ name = name }, ExampleClass)
return self
end

function ExampleClass.static()
print("Inside Static Function")
end

function ExampleClass:method()
print(self.name .. "'s method.")
end

-- Prints "Inside Static Function"
ExampleClass.static() -- works as expected

local instance = ExampleClass.new('Named instance')
instance:method()
instance.static() -- unexpected/wrong???

-- Deleting self-referencing class index doesn't help:
ExampleClass.index = nil
ExampleClass.static() -- works as expected
instance.static() -- throws error (good!)
instance:method() -- ALSO throws error (bad!)

The issue here is that static function CAN be accessed from the instance while they shoudn't.

If I understand correctly, this is because "methods" live in class table, which is instance's metatable and referred whenever something is not declared in instance table. This makes it even worse: all the static properties are also accessible from instance. Thank's God they point to the same reference 😳.

Is there an established way to have "true" static functions in Lua? Or is this concept pretty much misused?

I know that Lua's OOP is often most-likely prototype based. But so is e.g. JS where still static is a static:

class Class {
constructor() {
this.prop = "";
}
static staticFunction() {
console.log("static");
}
methodFunction() {
console.log("method");
}
}

let instance = new Class();
Class.staticFunction(); // works
instance.methodFunction(); // works
instance.staticFunction(); // ERROR: not a function

https://redd.it/1i49gwm
@r_lua

Just started learning - could use some help explaining some things

I have little experience in languages like Python and Java but wanted to learn Lua to make Roblox noscripts along with 2D games. I want to start off by just learning Lua as a whole. I've been learning for the past 3 days now (7 hours coding, and about 2 hours watching videos). Something that I'm struggling to get is the for and repeat loop, along with tables.

for a for loop the only thing I can do/make is:

for i = 1, 10 do
print("Hi.")
end

for tables, I try to make word-guessing games, or guess the length of a word but always have issues calling it from the table

local words = {
    "Dog", "Wire", "Mountian", "Tree", "House", "Car", "Bike", "Plane", "Boat",
    "Train", "Donkey", "Cat", "Fish", "Bird", "Lion", "Tiger", "Bear", "Wolf", "Fox", "Rabbit", "Horse",
    "Cow", "Pig", "Sheep", "Goat", "Chicken", "Duck", "Goose", "Turkey", "Penguin", "Ostrich", "Eagle", "Hawk",
    "Falcon", "Owl", "Parrot", "Crow", "Raven", "Seagull", "Dove", "Sparrow", "Robin", "Bluejay", "Cardinal", "Woodpecker",
    "Hummingbird", "Swan", "Pelican", "Flamingo", "Stork", "Crane", "Heron", "Ibis", "Vulture", "Condor", "Albatross", "Puffin", "Pigeon", "Starling", "Nigger"
}

io.write("Select a letter: ")
local userLetter = io.read():upper()

local matchingWords = {}
for , word in ipairs(words) do
    if word:sub(1, 1) == userLetter then
        table.insert(matchingWords, word)
    end
end

if #matchingWords > 0 then
    print("Words starting with '" .. userLetter .. "':")
    for , word in ipairs(matchingWords) do
        print(word)
    end
else
    print("No words found starting with '" .. userLetter .. "'.")
end

https://redd.it/1i4bumn
@r_lua

Lua ressources for intermediate programmers

Hello,

I am a hobbyist programmer with an background in math and an interest in computer science.

I worked myself through "COMMON LISP: A Gentle Introduction to Symbolic Computation" which was great. The exercises were trickey but also great fun and I learned a lot .

Now I developed an interest in Lua and I am allmost through "Programming in Lua". It is a great book about lua, but not a programming course.

Can you recommand good didactic ressources about programming/computer science on an intermediate to advanced level, that use lua as an prgramming language?

So far I found

\- Lua programming gems

\- https://github.com/a327ex/blog/issues/30



That should keep me busy for a while, but I am wondering, if there are other interesting options.

Thanks in advance!

https://redd.it/1i4f9qy
@r_lua

What are things lua is missing or needs to change that you'd like to see?

Currently, I'm working on a small project that transpiles a custom version of lua's syntax to original lua. I plan to make an extension for it to use in my projects.

Here's an overview of it. This is what the transpiler sees in terms of types.

https://preview.redd.it/1x36nwz0tsde1.png?width=676&format=png&auto=webp&s=4feae0111a59867c9e896ced735cf700fe4e882f

Let me know, I'll gladly take suggestions! Specially on classes, I'm not sure how built in class would look.

https://redd.it/1i4eeq3
@r_lua

HI im trying to learn lua and im 12

im trying to learn lua and im 12 so do someone knows a free app to learn lua ?
thx !

https://redd.it/1i4iut6
@r_lua

A Hot Reloader Web Server made in Lua

https://github.com/OUIsolutions/yahr

https://redd.it/1i4kfzi
@r_lua

Terminal don't print anything of my lua code. Where did i go wrong?

Hi! I'm here again. I'm checking my learn on lua making a code. This code verify if talent (TLT) and efforce (EFT) are true, and then change the variables to make then have the same level, hp, and xp, even though they work by different ways. Buut, i guess something is wrong, since terminal don't print nothing. Someone can help me? Thanks for attention :)

HP = 0
XP = 0
LV = 0
EFT = false
TLT = true
TT = 0

if EFT == true then
HP = HP + 20
TTpoints = 10
XPproductionVR = 2
elseif TLT == true then
HP = HP + 5
TTpoints = 5
XPproductionVR = 8
elseif EFT == true and TLT == true then
HP = HP + 25
TTpoints = 10
XPproductionVR = 4
end

function TTproduction()
TT = TT + TTpoints
end
function XPproduction()
XP = TT * XPproductionVR
end

if TLT == true then
LevelUpVR1 = 20
LevelUpVR2 = 40
LevelUpVR3 = 60
elseif EFT == true then
LevelUpVR1 = 40
LevelUpVR2 = 80
LevelUpVR3 = 120
elseif TLT == true and EFT == true then
LevelUpVR1 = 40
LevelUpVR2 = 80
LevelUpVR3 = 120
end

if XP < LevelUpVR1 then
LV = 0
elseif XP >= LevelUpVR1 then
LV = 1
elseif XP >= LevelUpVR2 then
LV = 2
elseif XP == LevelUpVR3 then
LV = 3
end

while LV < 3 do
TTproduction()
XPproduction()
end

if LV == 0 then
HP = 5
elseif LV == 1 then
HP = 10
elseif LV == 2 then
HP = 20
elseif LV == 3 then
HP = 30
end

print(HP, XP, LV)

https://redd.it/1i4hiyk
@r_lua

What's the issue here?
https://redd.it/1i50v0y
@r_lua

Can someone please help me with my noscript?

I made a noscript for a game with chatgpt, it's basically 3 noscripts in one.

1-Caps Lock + Right Mouse Button + Left Mouse Button Rapid-Fire: This functionality is only activated when Caps Lock is on. It allows for rapid clicking when the right mouse button is held and the left mouse button is also held.

2-Right Mouse Button Toggles Right Shift: This noscript presses the Right Shift key when the right mouse button is pressed and releases it when the right mouse button is released. It operates independently of the other noscript's conditions.

3-Mouse Button Interactions: It handles mouse movements when the right mouse button is held, and the left mouse button is also held.

The issue is that when I press capslock so number 1 can work, the other two functions stop working. I need nr2 and 3 to always be active, but as soon as I turn on capslock for the rapid fire then only rapid fire works.

Here is the noscript but pasting it here messes up the formatting for some reason so here is also a screenshot how it looks like in the logitech ghub software: https://i.imgur.com/PiiaGfB.png

EnablePrimaryMouseButtonEvents(true)

function OnEvent(event, arg)
-- First Script: Caps Lock + Right Mouse Button + Left Mouse Button Rapid-Fire
if IsKeyLockOn("capslock") then -- Check if Caps Lock is enabled
if IsMouseButtonPressed(3) then -- If the right mouse button is held
repeat
if IsMouseButtonPressed(1) then -- If the left mouse button is held
repeat
PressMouseButton(1) -- Press left mouse button
Sleep(50) -- Speed of rapid-fire, adjust as needed
ReleaseMouseButton(1) -- Immediately release after pressing
until not IsMouseButtonPressed(1) -- Stop when left mouse button is released
end
until not IsMouseButtonPressed(3) -- Stop when the right mouse button is released
end
end

-- Second Script: Right Mouse Button toggles Right Shift (always active)
if event == "MOUSEBUTTONPRESSED" and arg == 2 then -- Right mouse button
PressKey("RSHIFT") -- Press Right Shift
return -- Exit here to avoid interference
elseif event == "MOUSEBUTTONRELEASED" and arg == 2 then
ReleaseKey("RSHIFT") -- Release Right Shift
return -- Exit here to avoid interference
end

-- Second Script: Mouse button interactions (always active)
if IsMouseButtonPressed(3) then
repeat
if IsMouseButtonPressed(1) then
repeat
MoveMouseRelative(0, 2)
Sleep(90)
until not IsMouseButtonPressed(1)
end
until not IsMouseButtonPressed(3)
end
end



Really hope someone can help me with this because chatgpt is messing it up.

https://redd.it/1i5zjpp
@r_lua

Logitech G hub noscript help

function OnEvent(event, arg)

if event == "MOUSE_BUTTON_PRESSED" and arg == 5 then

print("Hello")

end

end

is something wrong with this code? I want it to print Hello when mouse 5 is pressed but nothing seems to happen in the console?

https://redd.it/1i60hor
@r_lua

Made a Tutorial to Learn Lua Quickly
https://www.youtube.com/watch?v=ZvfERGBI3Io

https://redd.it/1i7bxs8
@r_lua

Issue with Lua Script for a Library
https://github.com/vvhoy884ugvv/Pls-try-to-fix-/blob/main/INILHUB.txt

https://redd.it/1i7gzdo
@r_lua

How to write code to add a specific number to an existing value

This might be a very basic query, but I've gotta learn somehow. So let's say I have an address with a value of 1000, which in hex is 3E8. And I want to add 200 to it, which would be C8. Is it possible to write code that makes that happen? Something like :

BlobHP = 0x8086963

If ReadShort BlobGainsItem
add (C8) to BlobHP.

That probably hurt to read if you're actually good at this and I wouldn't actually write it like that, but I'm just trying to get the idea of what I mean across. Pls help if you know how.

https://redd.it/1i87v0k
@r_lua

darwin first beta: 0.017 released,the most advanced lua compiler

https://github.com/OUIsolutions/Darwin

https://redd.it/1i8egzo
@r_lua

question from complete beginner about for loops

https://preview.redd.it/lf9ecc7rutee1.png?width=1920&format=png&auto=webp&s=335377fa473beea58aca5a3ce37b0ed19a59d5e9

hi, i am a complete beginner in both lua and programming in general. i was just wondering if there is a way to make a variable using for loops (as you can see i'm repeating the same loop multiple times)

sorry if this has been asked before, i didn't really know what to search for on google for my question, thanks!

https://redd.it/1i8hanw
@r_lua

Matching markdown tables (regex)

I have a Lua noscript that parses MediaWiki markdown tables. It works great for "flat" tables where the elements in a row are all inline and separated with double pipes, but I'm having trouble making a separate noscript to deal with tables with each field on a different line such as this:

|-
| Game ABC
|{{untested}} <!-- xefu -->
|{{untested}} <!-- xefu2 -->
|{{untested}} <!-- xefu3 -->
|{{untested}} <!-- xefu5 -->
|{{untested}} <!-- xefu11 -->
|{{untested}} <!-- xefu6 -->
|{{playable}} <!-- xefu7 -->
|{{untested}} <!-- xefu7b -->
|{{untested}} <!-- xefu2019 -->
|{{untested}} <!-- xefu2021a -->
|{{untested}} <!-- xefu2021b -->
|{{untested}} <!-- xefu2021c -->
| Name Here
| Notes Here
|-
| Another Game
|{{menus}} <!-- xefu -->
|{{untested}} <!-- xefu2 -->
|{{menus}} <!-- xefu3 -->
|{{untested}} <!-- xefu5 -->
|{{untested}} <!-- xefu11 -->
|{{menus}} <!-- xefu6 -->
|{{menus}} <!-- xefu7 -->
|{{menus}} <!-- xefu7b -->
|{{untested}} <!-- xefu2019 -->
|{{untested}} <!-- xefu2021a -->
|{{untested}} <!-- xefu2021b -->
|{{untested}} <!-- xefu2021c -->
| Names Here
| Notes Here
|-

I'm interested in taking the info between two different |- as one entry.

I feel like I'm close, but having trouble since Lua doesn't seem to support lookahead or non-capture groups:

for row in wikitable:gmatch("|%-(.-)|%-") do

https://redd.it/1i9gn5f
@r_lua

Lua Powered Remote Garage Door Controller

This Lua-powered DIY DoorController project provides a web-based solution for controlling a garage door remotely. It includes a minimally invasive design with a magnetic reed switch for detecting door states and an NPN transistor for simulating button presses on a generic garage door remote. The software provides a web interface that can be added to mobile home screens for app-like functionality. The project also supports email garage door open/close state logging by configuring SMTP settings.

Project link: https://github.com/jjsch-dev/DoorController

https://redd.it/1i9ujlv
@r_lua