Erlang · Expert

Lesson 1 · On the house

gen_statem state machines

Model protocols as explicit states with gen_statem, state_functions, and state timeouts.

Lesson 2

Hot code loading

Two code versions, fully qualified calls, code:load_binary, and soft_purge.

Lesson 3

ETS match specifications

Query ETS with select, match specs, ets:fun2ms, and select_delete.

Lesson 4

Binary memory and performance

Heap vs refc binaries, sub-binaries, binary:copy, and building output with iolists.

Lesson 5

persistent_term, atomics, and counters

Global read-mostly config and lock-free shared integers without processes or ETS.

Lesson 6

Tracing live systems

erlang:trace and trace patterns to observe calls in production without restarting.

Lesson 7

Testing with EUnit

Test functions, assertion macros, generators, and fixtures with setup and cleanup.

Lesson 8

Ports: talking to external programs

open_port, spawn_executable, exit_status, line mode, and when to use NIFs instead.

Lesson 9

Overload and backpressure

Mailbox growth, message_queue_len, call-based flow control, and load shedding.

Lesson 10

Distributed Erlang

Named nodes, cookies, net_adm:ping, remote spawn, and global process groups.