[julia-users] Execution order of nested iterations in comprehensions vs for loops

[Peter Simon]

Comprehensions and for loops do not perform nested looping in the same 
order:

julia> [begin println((i,j)); (i,j) end  for i = 1:3, j = 1:4]
(1,1)
(2,1)
(3,1)
(1,2)
(2,2)
(3,2)
(1,3)
(2,3)
(3,3)
(1,4)
(2,4)
(3,4)
3x4 Array{(Int64,Int64),2}:
 (1,1)  (1,2)  (1,3)  (1,4)
 (2,1)  (2,2)  (2,3)  (2,4)
 (3,1)  (3,2)  (3,3)  (3,4)


julia> for i = 1:3, j=1:4
           println((i,j))
       end
(1,1)
(1,2)
(1,3)
(1,4)
(2,1)
(2,2)
(2,3)
(2,4)
(3,1)
(3,2)
(3,3)
(3,4)



Just wondering what the rationale is for this difference.

--Peter