A super simple benchmark function in Lua

bench.lua

---Run a benchmark
---@param fn function
---@param outer_iter integer?
---@param inner_iter integer?
local function bench(fn, outer_iter, inner_iter)
	outer_iter = outer_iter or 100
	inner_iter = inner_iter or 10000

	local times = {} ---@type number[]
	for i = 1, outer_iter do
		local from = os.clock()
		for j = 1, inner_iter do
			fn()
		end
		local to = os.clock()

		times[#times + 1] = to - from
	end

	local sum = 0
	for i = 1, #times do
		sum = sum + times[i]
	end

	print('average seconds:', sum / #times)
end