The Joy of Functional Programming
summary
Argues that functional programming gives concrete benefits: referential transparency and pure functions let compilers reorder work and run independent tasks concurrently, Java 8 Streams show this with map/filter/collect examples (replacing flag-filled loops), a stock-price example uses a Stream then switches to parallel stream for measurable speedup, lazy evaluation avoids unnecessary work, and purity makes testing and concurrency simpler; cites history (lambda calculus 1930s, OO mainstream ~1967→1990) and real-world failures like 10–35% hospital infection rates before hygiene.
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chapters (13)
- 0:00Welcome
- 3:42Mainstream beliefs
- 15:44Java and C dominance
- 18:13The slow rise of object-oriented programming
- 25:24The joy of functional programming introduction
- 27:12Lambda calculus roots
- 34:39Statements vs expressions
- 38:11Imperative vs declarative
- 46:46Why FP feels adult
- 53:10Lazy evaluation core
- 57:26FP for real problems
- 1:00:16Balancing FP and imperative
- 1:03:27Q&A
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