Functional Programming in 40 Minutes

on YouTube ↗42m

" summary

Functional programming centers on pure functions, immutable persistent data structures, and explicit bridges to the messy world like atoms and agents or queues that sequence side effects. Data structures use structural sharing (wide branching, e.g. 32) so copies are cheap; threads can’t corrupt shared state and a whole class of concurrency bugs disappears. Production code ends up as many small testable functions with a few protocols — example: Pedestal is ~18.7k lines with 944 functions, 28 protocols, 8 state bridges, showing the approach scales.

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" chapters (13)

1. 0:00Start
2. 3:12FORGET Everything You Know About Programming
3. 8:54During the type erasure process, the Java compiler erases all type parameters and replaces each with its first bound if the type parameter is bounded, or Object if the type parameter is unbounded
4. 21:40Copies Copies Copies
5. 26:13EFFECTS
6. 33:43Magic
7. 33:56off-by-one errors
8. 34:09REDUNDANT
9. 34:53database is
10. 38:5018,706 lines
11. 39:1828 protocols
12. 39:388 bridges to the stateful world
13. 40:05944 functions

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