How for iv in pairs and getservice varaibales works?

Hello, JasiuJasiuB!

For ... do loop

a for ... do loop increments a value until it reaches an objective:

for i=1, 5 do
    print(i)
end

prints:

1
2
3
4
5

for ... do loops can be also used with tables:

local table = {"value1", "value2", "value3", "value4", "value5"}

for i,v in pairs (table) do
    print(v)
end

this results in:

value1
value2
value3
value4
value5

It is exactaly the same as doing

local table = {"value1", "value2", "value3", "value4", "value5"}

print(table[1])
print(table[2])
print(table[3])
print(table[4])
print(table[5])

This makes your code lots smaller, as you can see

game:GetService()

game:GetService() is used to get internal services of roblox, like the UserInputService or MessagingService

There're some special services, that you can see on the studio, such as Players, ReplicatedStorage, ServerStorage, and many others.

I'll explain just what you want, as I don't want this to be too long: game:GetService("Players"):GetPlayers() -- this will return a table containing all the players objects on the game, so we can use a for ... do loop to cycle it:

local playersList = game:GetService("Players"):GetPlayers()
for i,v in pairs(playersList) do 
    --code
end

Useful links:

https://developer.roblox.com/en-us/api-reference/function/ServiceProvider/GetService

https://www.lua.org/pil/4.3.4.html

https://developer.roblox.com/en-us/api-reference/function/Players/GetPlayers

Hope this helps!