Thanks, it works.
In case, my initial map is a ref type
(def m (ref { } ))
Why this isn't working?
(dosync
(alter m #(update-in @v [1] (fnil conj [ ])) 11))
On Tuesday, June 17, 2014 7:55:14 PM UTC+2, Mauricio Aldazosa wrote:
>
> For updating the value of a map given a key you can use update-in:
>
> user> (update-in {1 [11]} [1] conj 22)
> {1 [11 22]}
>
> Now, to handle the case when the key is not present, you can use fnil:
>
> user> (update-in {} [1] (fnil conj []) 22)
> {1 [22]}
>
> Cheers,
> Mauricio
>
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