Re: destructuring vectors with :or
Clojure documentation only talks about
:or followed by a map (from http://clojure.org/special_forms ):
Also optionally, an *:or* key in the binding form followed by another
map may be used to supply default values for some or all of the keys if
they are not found in the init-expr:
(let [{a :a, b :b, c :c, :as m :or {a 2 b 3}} {:a 5 :c 6}]
[a b c m])
-[5 3 6 {:c 6, :a 5}]
On Friday, April 12, 2013 6:00:27 PM UTC-4, henry clifford wrote:
I'm trying to use the :or destructuring syntax as seen here applied to a
map
(def point {:y 7})
(let [{:keys [x y] :or {x 0 y 0}} point]
(println x: x y: y))
x: 0 y: 7
but I can't get this to work with vectors:
(def point [7])
(let [[x y :or [0 0]] point]
(println x: x y: y))
what' I'm expecting is x:7 y:0
but I'm getting Exception Unsupported binding form: :or
Any thoughts on this?
Thanks!
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Re: destructuring vectors with :or
Fantastic, thank you!
On Friday, April 12, 2013 11:13:23 PM UTC+1, John Hume wrote:
You can use a map destructuring form on a vector like so:
(let [{x 0 y 1 :or {x 0 y 0}} [7]] [x y])
returns [7 0]
On Fri, Apr 12, 2013 at 5:00 PM, henry clifford
h.a.cl...@gmail.comjavascript:
wrote:
I'm trying to use the :or destructuring syntax as seen here applied to a
map
(def point {:y 7})
(let [{:keys [x y] :or {x 0 y 0}} point]
(println x: x y: y))
x: 0 y: 7
but I can't get this to work with vectors:
(def point [7])
(let [[x y :or [0 0]] point]
(println x: x y: y))
what' I'm expecting is x:7 y:0
but I'm getting Exception Unsupported binding form: :or
Any thoughts on this?
Thanks!
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destructuring vectors with :or
I'm trying to use the :or destructuring syntax as seen here applied to a map
(def point {:y 7})
(let [{:keys [x y] :or {x 0 y 0}} point]
(println x: x y: y))
x: 0 y: 7
but I can't get this to work with vectors:
(def point [7])
(let [[x y :or [0 0]] point]
(println x: x y: y))
what' I'm expecting is x:7 y:0
but I'm getting Exception Unsupported binding form: :or
Any thoughts on this?
Thanks!
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Re: destructuring vectors with :or
You can use a map destructuring form on a vector like so:
(let [{x 0 y 1 :or {x 0 y 0}} [7]] [x y])
returns [7 0]
On Fri, Apr 12, 2013 at 5:00 PM, henry clifford h.a.cliff...@gmail.com wrote:
I'm trying to use the :or destructuring syntax as seen here applied to a map
(def point {:y 7})
(let [{:keys [x y] :or {x 0 y 0}} point]
(println x: x y: y))
x: 0 y: 7
but I can't get this to work with vectors:
(def point [7])
(let [[x y :or [0 0]] point]
(println x: x y: y))
what' I'm expecting is x:7 y:0
but I'm getting Exception Unsupported binding form: :or
Any thoughts on this?
Thanks!
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