The interim result is however not entirely equivalent.
user=> (counted? '(1 2 3))
true
user=> (counted? (concat '(1 2 3) '(4)))
false
user=> (counted? (doall (concat '(1 2 3) '(4
false
YMMV as always…
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Of course, lazy Clojure functions like "concat" end up basically doing this:
(def q (concat '(1 2 3) '(4)))
q
|
|
V
[lazy-concat]
| |
V V
'(1 2 3) '(4)
The result of a lot of concats ends up therefore being a tree
structure under the hood. It can be flat
