[julia-users] question on performance

[cnbiz850]

I tried to use comprehension in loops but found it somehow slower. In 
the following example, the loop in first code is slower than in the 
second.  Would anyone please explain why?

=======
function ffcombs()
    [Int8[i1,i2] for i1 in II, i2 in II]
end
combs = ffcombs()
ii = zeros(Int8,2)
for ii in combs
    ...
end
==========

for i1 in II, i2 in II
    ...
end