A talk given at Den of Clojure, Feb 8. Slides updated after some questions and feedback from audience.

1. What's new in
Clojure 1.9
at least that I think are cool

2. Reader Syntax
Namespaced Maps
Only keywords or symbols are affected

3. Reader Syntax
Namespaced Maps
Even using the current namespace

4. Predicate functions

5. Examples of Predicates

6. Atoms: swap/reset
Before 1.9
Save the value
Modify it
Or..
Don't do this at home
You could have race
conditions with something updating
before you could copy it off
Still ... a little ugly

7. swap-vals!
Returns a vector with old val and new val
reset-vals! Works the same way
Destructuring

8. brew install clojure
it gives you commands clj and clojure.

9. shell scripting anyone?
Note: doesn't need .clj extension

10. Open a REPL
Install rlwrap so you can
press up for previous statement
Also install rewrap by brew

11. deps.edn
open a repl in the directory, dependancies are loaded

12. Fix for Docstrings

13. Thanks :)