Julia is column-major, so it’ll be faster to flip your array’s indices and use column-wise slices. Try collect(eachcol(arr)), or eachrow if you really need the rows for some reason.
julia> arr = rand(1:15, (3,4))
3×4 Array{Int64,2}:
9 14 9 1
5 8 13 5
4 13 15 4
julia> collect(eachcol(arr))
4-element Array{SubArray{Int64,1,Array{Int64,2},Tuple{Base.Slice{Base.OneTo{Int64}},Int64},true},1}:
[9, 5, 4]
[14, 8, 13]
[9, 13, 15]
[1, 5, 4]