what's the difference between gen/hash-map and just using gen/fmap (fn [a] {:a a}) ...?

@ackerleytng hash-map can take multiple key-value pairs

(whereas in your example, the function you pass to fmap only takes a single value)

under the hood, hash-map does use fmap with zipmap to combine these into a map, which is just a more general version of your code above: https://github.com/clojure/test.check/blob/729de024f245c07011a2cd2fcaad04bcd90a223d/src/main/clojure/clojure/test/check/generators.cljc#L645-L646

i see, thanks!

Is there a way to only check the keys explicitly written in a Spec? i.e. No implicit validation of keys. I have a case where I need to validate partial pieces of a larger map.

@kenny when would spec implicitly validate your key?

Any map implicitly validates all keys against existing specs.

select-keys before validating?

Could totally do that but then I need to write the set of keys twice.