Clojure · Medium

Lesson 1 · On the house

Multimethods

defmulti dispatch functions, defmethod, :default, and hierarchies.

Lesson 2

Protocols and records

defprotocol, defrecord, extend-protocol, and when to prefer them over maps.

Lesson 3

Macros: code that writes code

defmacro, syntax-quote, unquote ~ and splicing ~@, and macroexpand.

Lesson 4

Transducers

Composable transformations without intermediate seqs: comp, transduce, into, sequence.

Lesson 5

Refs and STM

Coordinated changes with ref, dosync, alter, commute, and ensure.

Lesson 6

Futures, promises and delays

future for background work, promise/deliver, delay/force, and deref with timeout.

Lesson 7

core.async channels

chan, >!! and <!!, go blocks with >! and <!, buffers, and close!.

Lesson 8

Java interop

Static calls, instance methods, new, doto, and type hints.

Lesson 9

Testing with clojure.test

deftest, is, testing, are, fixtures, and running tests.

Lesson 10

Laziness pitfalls

Chunked seqs, holding the head, realized?, and dynamic scope escaping lazily.