Nested loops

[shut sinew]

Hey can you help me understand what a nested loop is?

local CUBE_SIZE = 2

function makecube()
    local cube = Instance.new("Part")
    cube.Size = Vector3.new(CUBE_SIZE, CUBE_SIZE, CUBE_SIZE)
    cube.Color = Color3.fromRGB(255, 255, 0)
    cube.CFrame = CFrame.new(14.8, 0.5, 29.4)
    cube.Parent = game.Workspace
end

for heightIndex = 1, TOWER_SIZE do
    local spawnY = (heightIndex - 1) * CUBE_SIZE
for heightIndex = 1, TOWER_SIZE do
        local spawnY = (heightIndex - 1) * CUBE_SIZE

             for lengthIndex = 1, TOWER_SIZE do
            local spawnX = lengthIndex * CUBE_SIZE
            
            for widthIndex = 1, TOWER_SIZE do
                local spawnZ = widthIndex * CUBE_SIZE
                makecube(spawnX, spawnY, spawnZ)
                task.wait(0.25)
            end
            end
        end
end```

[native portal]

loop inside of another loop is considered a nested loop

These are useful when we have 2 dimensional matrix data

basically imagine a list of folders inside of server storage and all of these folders have Instances inside of them

The nested loop would iterate through the folder's top level contents while the main loop would iterate through the folder in server storage

And regarding the code you sent, it would be cool if you could explain what you're trying to achieve

unless it's not really connected to the asked question

[shut sinew]

I'm trying to spawn parts on top of each other

[native portal]

first of all this one will fail horribly because you have your starting point and end point as heightIndex and TOWER_SIZE

but you don't compare it in any way <- ignore that
You don't change the index value in any way

secondly

[shut sinew]

hightIndex is 1 and TOWER_SIZE is 5 then it would count to 5 right?

[native portal]

https://create.roblox.com/docs/tutorials/fundamentals/coding-4/intro-to-for-loops

read through this regarding for loops

to see the problem that you have

secondly why there's 2nd for loop for height?

[shut sinew]

i don't know that's why im asking

[native portal]

is that code written by you or?

for heightIndex = 1, TOWER_SIZE do
    local spawnY = (heightIndex - 1) * CUBE_SIZE

    for lengthIndex = 1, TOWER_SIZE do
        local spawnX = lengthIndex * CUBE_SIZE
            
        for widthIndex = 1, TOWER_SIZE do
            local spawnZ = widthIndex * CUBE_SIZE
            makecube(spawnX, spawnY, spawnZ)
            task.wait(0.25)
        end
    end
end

-- Ignore this

[shut sinew]

no it's listed here https://create.roblox.com/docs/tutorials/fundamentals/coding-4/nested-loops

[native portal]

it is listed there but it's listed as this:

for heightIndex = 1, TOWER_SIZE do

    local spawnY = (heightIndex - 1) * CUBE_SIZE

    currentColor = Color3.fromRGB(math.random(0, 255), math.random(0, 255), math.random(0, 255))

    for lengthIndex = 1, TOWER_SIZE do

        local spawnX = lengthIndex * CUBE_SIZE

        for widthIndex = 1, TOWER_SIZE do

            local spawnZ = widthIndex * CUBE_SIZE

            makecube(spawnX, spawnY, spawnZ)

            task.wait(0.25)

        end

    end

end

Could you repeat what problem you're having?

[shut sinew]

I'm trying to understand what this means for example

for heightIndex = 1, TOWER_SIZE do
local spawnY = (heightIndex - 1) * CUBE_SIZE

I know it counts from 1 to 5

[native portal]

yes

[shut sinew]

but what does the next line mean

[native portal]

local spawnY = (heightIndex - 1) * CUBE_SIZE ?

[shut sinew]

yes

[native portal]

it assigns value to spawnY variable which gets calculated using heighIndex and CUBE_SIZE

basically for first iteration it would be local spawnY = (1 - 1) * 2

[shut sinew]

what is this for?

[native portal]

check for makecube function

[shut sinew]

ok I get 0 for spawnY what is next?

[fossil flame]

** You are now Level 3! **

[shut sinew]

for spawnX I get 2

and spawnZ is 2

what does it do next? makecube(0, 2, 2)

nevermind I think that you multiple 2, 5 times since it counts to 5

I get 64 for spawnX

it shows this in output when I print spawnX

so for loop adds 2 each time it count from 1-5

spawnY is 0

spawnZ is 25

I got makecube(10,0,25)

What does it do next?