Re: Tips and questions concerning a prime sieve in Lua
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- Subject: Re: Tips and questions concerning a prime sieve in Lua
- From: v <v19930312@...>
- Date: 2020年12月05日 14:12:58 +0300
Not related to performance, minor style remarks:
> for i = 1, q, 1 do
> k = 3 - k
> c = c + 4*k*i
> j = c
> local ij = 2*i*(3-k)+1
> t = t + 4*k
> while j <= M do
> S[j] = 0
> j = j + ij
> ij = t - ij
> end
> end
Third argument to for is optional and equals 1 by default. You can omit
it here.
> for _, v in next, S do
> if v > 0 then
> result[#result + 1] = v
> end
> end
It took me a few seconds to understand what this loop does. On the
other hand,
for _, v in pairs(S) do
...
end
is idiomatic and easy to read.
--
v <v19930312@gmail.com>