Ah. But a new map is being created with the default :or operation. I
guess the ability to get this entire map with defaults is not
available directly from clojure destructuring binding.
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No, no new map is created. The :or clause simply creates the local
binding for you if none existed in the map; there's no need for it to
create a second map to do this.
On Jan 6, 6:27 pm, Seth wbu...@gmail.com wrote:
Ah. But a new map is being created with the default :or operation. I
guess the
Is there any way to get the entire map when destructuring plus the
defaults?
(let [{:keys [a] :or {a 4} :as b} {:b 3}] b)
returns {:b 3}
but i would like it to return {:b 3 :a 4}
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The :as option in destructuring forms binds the original value being
destructured -- no entire map is being formed in the background ahead of time.
So, build that entire map as you require; e.g.:
= (let [{:keys [a] :as b} (merge {:b 3} {:a 4})] b)
{:a 4, :b 3}
- Chas
On Jan 4, 2011, at 7:38
