Would somebody be able to tell me why this doesn't work? (-> [1 2 3] (filter odd?))

try to macroexpand it

user=> (macroexpand-1 '(-> [1 2 3] (filter odd?)))
(filter [1 2 3] odd?)

You need ->> is this particular case :)

In the "Pull" section of the Datomic on-prem tutorial(https://docs.datomic.com/on-prem/tutorial.html#pull), db/pull returns data that looks like this:

#:inv{:color #:db{:ident :blue}, ...}

#:foo{:bar 1 :baz 2} is sugar for {:foo/bar 1 :foo/baz 2}

i.e. all the idents (keywords and symbols) used as keys in the map will be namespaced by the prefix

Oooooh. I had no idea. Cool. Thanks!

https://groups.google.com/forum/#!topic/clojure-dev/8tHLCm8LpyU for the introduction post

assume I want to use some java 8 features in some piece of code if that code is running under java 8, but revert to a java 6 compatible code snippet when running under java 6. Would that be possible in clojure? And how? Conditional require call?

@d4hines You'll probably find this section of the destructuring guide helpful too https://clojure.org/guides/destructuring#_namespaced_keywords

And the reader literal syntax associated with maps is discussed here https://clojure.org/reference/reader#_maps

@bronsa, @seancorfield, all of that is clarifying. Thanks!