The Taming of the Deftype

Slides from a talk I presented at Clojure/West 2012, San Jose, CA.

Transcript

1. deftype the taming of the Baishampayan “BG” Ghose @ghoseb Clojure/West 2012 Friday 16 March 12
2. @ghoseb helpshift.com Friday 16 March 12
3. @ghoseb helpshift.com I caught a dead mouse in the office the other day Friday 16 March 12
4. MOTIVATION Friday 16 March 12
5. Friday 16 March 12
6. Friday 16 March 12
7. Maps Friday 16 March 12
8. Records Friday 16 March 12
9. Types Friday 16 March 12
10. TO SUMMARIZE Friday 16 March 12
11. deftype Performance Collection Abstractions Named Type Mutable Fields Full Control Friday 16 March 12
12. defrecord Performance Collection Abstractions Named Type HashMap Semantics * Friday 16 March 12
13. maps Every other use-case Friday 16 March 12
14. IN SHORT Friday 16 March 12
15. Use Maps! Friday 16 March 12
16. Dive into deftype Friday 16 March 12
17. Use the source, Luke! Friday 16 March 12
18. IPersistentMap Seqable Associative IPersistentCollection ILookup Counted IFn IPersistentSet IObj Object IMeta IPersistentStack Indexed IPersistentVector Friday 16 March 12
19. IPersistentMap Seqable Associative IPersistentCollection ILookup Counted IFn IPersistentSet IObj Object IMeta IPersistentStack Indexed IPersistentVector Friday 16 March 12
20. Friday 16 March 12
21. Scaffold Friday 16 March 12
22. ‘scaffold’ by Christophe Grand Friday 16 March 12
23. } Interface we want Ancestor interface Method sigs. . . . . . . . Friday 16 March 12
24. bit.ly/clj-scaffold steal this code! Friday 16 March 12
25. A Note About IFn Holy arities, Batman! Friday 16 March 12
26. A Note About IFn Should implement all to avoid non-helpful exception. Friday 16 March 12
27. MUTABLE TYPES Friday 16 March 12
28. ^:volatile-mutable ^:unsynchronized-mutable atomic reads & writes a ‘vanilla’ Java mutable field Friday 16 March 12
29. Friday 16 March 12
30. Printing Friday 16 March 12
31. clojure.core/print-method for humans Friday 16 March 12
32. clojure.core/print-dup for the reader Friday 16 March 12
33. #mylib.core.MyType[1,2,3] Object Literal Reader Syntax Friday 16 March 12
34. Factory Functions Friday 16 March 12
35. Hide Implementation Details Avoid Importing Java Classes Friday 16 March 12
36. (my-type :foo :bar) (import myns.MyType) (MyType. [:foo :bar]) vs. Friday 16 March 12
37. AN EXAMPLE IMPLEMENTATION (a weekend hack) Friday 16 March 12
38. bit.ly/clj-chainmap steal this code! Friday 16 March 12
39. Fin Friday 16 March 12
40. Friday 16 March 12