Functional Programming with Java 8
summary
Java 8 demonstrates concrete functional tools: lambda expressions (parameters + body, inferred return), single‑abstract‑method functional interfaces, method references, and streams (filter → map → sum) that replace verbose loops and compute “sum of double of even numbers” without mutable accumulators. Examples run and show lazy evaluation, safe captures via the effectively‑final rule, and easy conversion to parallel execution with parallel streams; a shown mutable closure hack breaks purity and is flagged as a bad idea.
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chapters (13)
- 0:00Introduction to FP in Java
- 1:57Problems with Imperative Code
- 5:23Assignment-less programming
- 8:36Immutability and side effects
- 10:40Higher-order functions
- 14:12Lambda expressions
- 17:26Iterators and collections
- 20:42Functional interfaces
- 24:13Method references
- 27:39Declarative vs imperative
- 32:49Closures and scope
- 36:57Lazy evaluation
- 44:10Benefits and conclusion
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