Thanks Meikel, your answer was very clear. On Wednesday, October 31, 2012 12:49:06 PM UTC+2, Meikel Brandmeyer (kotarak) wrote: > > Hi, > > I'm not sure what you are refering to in the provided link. If it's eg. > about :warehouses, then the difference is, that :warehouses contains a > vector in the example in the link. So you basically walk the warehouse > vector one warehouse at a time. But here you of only a single item (the > map), so you have to use :let. In case you'd want to treat the :warehouses > vector also as single item (instead of walking it), you'd also have to add > a :let there. > > Bottom line: :let keeps item as single entity, no-:let walks item as > sequence in an inner loop. > > (for [x [[1 2] [3 4] [5 6]] > y x] > y) > > => (1 2 3 4 5 6) > > (for [x [[1 2] [3 4] [5 6]] > :let [y x]] > y) > > => ([1 2] [3 4] [5 6]) > > I used for here, but doseq works the same way. > > Hope this clarifies. > > Meikel > >
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