- macro and accessing context
Hi,
I sometimes (in fact quite often) want to use the - macro like this:
(- {}
(assoc :a a)
(assoc :b (some-fn CTX)))
where CTX should be the current value of the threaded element. Currently,
I'm forced to write a helper function
(defn add-some-fn [ctx]
(assoc ctx :b (some-fn ctx)))
and rewrite my usage of - to
(- {}
(assoc :a a)
(add-some-fn))
This works, of course, but somehow feels awkward (it destroys the
uniformity of my assoc chaining). Is there a more idiomatic way to do this?
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Re: - macro and accessing context
Hi,
since 1.5 there is
as-http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/as-
:
(as- {} ctx
(assoc ctx :a a)
(assoc ctx :b (some-fn ctx)))
Kind regards
Meikel
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Re: - macro and accessing context
That looks like it can do the job; thanks!
On Tuesday, July 2, 2013 8:12:04 AM UTC+2, Meikel Brandmeyer (kotarak)
wrote:
Hi,
since 1.5 there is
as-http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/as-%3E
:
(as- {} ctx
(assoc ctx :a a)
(assoc ctx :b (some-fn ctx)))
Kind regards
Meikel
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Re: - macro and accessing context
I believe the intended idiom for as- (and the reason it doesn't take a
binding vector, like other forms that create locals) is
(- {}
(assoc :a a)
(as- ctx
(assoc ctx :b (some-fn ctx
On Jul 2, 2013 1:12 AM, Meikel Brandmeyer (kotarak) m...@kotka.de wrote:
Hi,
since 1.5 there is
as-http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/as-%3E
:
(as- {} ctx
(assoc ctx :a a)
(assoc ctx :b (some-fn ctx)))
Kind regards
Meikel
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