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# Sieve of Eratosthenes, docstrings coming in Julia 0.4 | |
function es(n::Int64) # accepts one 64 bit integer argument | |
isprime = ones(Bool, n) # n-element vector of true-s | |
isprime[1] = false # 1 is not a prime | |
for i in 2:int64(sqrt(n)) # loop integers from 2 to sqrt(n), explicit conversion to integer | |
if isprime[i] # conditional evaluation | |
for j in (i*i):i:n # sequence from i^2 to n with step i | |
isprime[j] = false # j is divisible by i | |
end | |
end | |
end | |
return filter(x -> isprime[x], 1:n) # filter using anonymous function | |
end |
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