If you use (empty m) rather than {} it will also work for other types.

On Dec 7, 5:45 am, Ken Wesson <kwess...@gmail.com> wrote:
> This is also very easy to implement:
>
> (into {}
>   (for [[k v] the-map]
>     [k (f v)]))
>
> e.g.
>
> user=> (into {}
>   (for [[k v] {:a 3 :b 7}]
>     [k (inc v)]))
> {:a 4, :b 8}
> user=>
>
> and to encapsulate as a function:
>
> (defn fmap [f m]
>   (into {}
>     (for [[k v] m]
>       [k (f v)])))

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