Luau - Readable number (using string operations)

readablenumber.lua

local function readableNumber(number: number, decimals: number)
	-- If the number is whole, just round and convert to a string that way
	if math.abs(number)%1 < 1e-9 then
		return tostring(math.round(number))
	end
	-- Format as a float to the number of decimals (e.g. %.2f = 2 decimals)
	local formatted = string.format(string.format("%%.%df", math.round(decimals)), number)
	-- Find the decimal point
	local point = string.find(formatted, "%.")
	-- Find as many zeros on the end as possible (the $ anchor matches the end of the string)
	local endZeros = string.find(formatted, "0+$", point)
	-- If the zeros start 1 character after the decimal point, remove them and the decimal
	if endZeros and endZeros - point == 1 then
		return string.sub(formatted, 1, point - 1)
	end
	return string.sub(formatted, 1, endZeros and endZeros - 1 or #formatted) -- Remove the zeros
end

This is a much cleaner version of https://gist.github.com/Hexcede/afae4714bf92997e5ffa38e9597f72ad using string operations instead.