Would # means like, number of... ? Also, is their a page in Roblox Wiki which I can find things like that? It would be helpful.
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What is # ?
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# is a prefix operator.
It's an operator (like + or * or . or /), and it's prefix (like - in -5 or -x) as opposed to infix (like + in 1 + 2).
#thing is supposed to correspond to the length of thing.
For strings, that means the number of characters, e.g. #("cat") is 3 and #("") is 0.
For lists, that means the number of things in the list, e.g., #({1, 5, 9}) is 3 and #({}) is 0.
For lists, it's a little complicated to say what "length" means, because of lists like this:
local t = {1, 2, 3, nil, 4}
The length of t, ie, #t is 3 or 5 -- don't put nils in lists), not 4. That's because nil doesn't count as an entry in the list.
Length of lists also ignores other keys, e.g.
local t = {name = "Silly", owner="blue", color="red", 99, 98}
The length of t is now 2 (it only counts the things at t[1] and t[2]).
Using metatables, you can define your own definition of # using the __len metamethod
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Also, I'm sure the OP could conclude this but if you want to reference it in a discussion of some sort, it is called the length operator.
Tells the the number of a specific thing. e.g. #game.Players:GetChildren() tells you how much children are in players. Lets say you have a table or array, if you want to choose something random from the table or array you could do
table = {"Hello World", 1}
print(table[math.random(1,#table)]) --Chooses a random thing to print. There are 2 things to print in this case.
You can also use this technique to choose a random player:
local players = game.Players:GetChildren() --Players
if game.Players.NumPlayers >= 2 then --If there are 2 or more players
print(players[math.random(1, #game.Players:GetChildren())].Name) --Print the random player's name. Notice the "#" before "game.Players.GetChildren()".
end
You can also find how much letters there are in a string.
local string1 = "LOLOLOLOL"
local string2 = "FooFoo"
print(#string1, #string2) --Print how many characters, should output "8-6"
This doesn't work for numbers. You can use string.len to find how many digits are in numbers.
local string = "1337"
local num = 1337
print(string.len(string), string.len(num)) --Should print "1-1".
I Hope this helps!
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Thanks to those who answered. I added 1 rep to each one of you(3).