Question

Is there a ‘proper’ way to iterate over a two-dimensional sequence in Clojure?
Suppose I had a list of lists of numbers, like this

 ((1 2 3)
  (4 5 6)
  (7 8 9))

and I wanted to generate a new list of lists with each number incremented by one. Is there an easy way to do this in Clojure without relying on nested maps or loop/recurs? I’ve been able to do it, but my solutions are ugly and I find them difficult to understand when I re-read them.

Thanks

Answer 1

You can always just use a list comprehension. I find myself using them quite often coming from an imperative background so I don’t know how idiomatic it is. In your specific case, you can do:

(for [my-list my-matrix] (map inc my-list))