I agree with someone else that the first thing you should do is see if you
can flatten the data in some way. I find that namespaced keywords often
help with that. If it doesn't make sense to flatten it, however, I'd use
specter <https://github.com/nathanmarz/specter>. It's for exactly this
use-case and really nice, despite the somewhat funky syntax.
(ns foo.core
(:require
[com.rpl.specter :as sp]))
(def m {:qs [{:nums [3 1 2]} {:nums [7 4]}]})
(sp/transform [:qs sp/ALL :nums sp/ALL] inc m)
;;=> {:qs [{:nums [4 2 3]} {:nums [8 5]}]}
On Tuesday, October 10, 2017 at 11:18:56 AM UTC-3, Rob Nikander wrote:
>
> Hi,
>
> Say I have a map like this:
>
> (def m {:qs [{:nums [3 1 2]} {:nums [7 4]}]})
>
> I want to transform each number with a function (say, `inc`). I imagine
> something like this:
>
> (update-in m [:qs * :cell-fns] #(map inc %))
> ; or
> (update-in m [:qs * :cell-fns *] inc)
>
>
> But of course you can't write that. The following code works, but I don't
> like reading it:
>
> (update m :qs
> (fn [qs]
> (mapv
> (fn [q]
> (update q :nums #(mapv inc %)))
> qs)))
> => {:qs [{:nums [4 2 3]} {:nums [8 5]}]}
>
> Is there an idiomatic way to do this, that looks more like the shorter
> `update-in` idea?
>
> Rob
>
>
>
>
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