Object- Oriented:
1. Started from Simula 67 (created in 1967), only went mainstream in 1983 by C++.
2. Java created in 1997 but too slow and memory – hungry for high-performance applications, only flourishes in 2000s after hardware improvement.
Functional Programming: 1958 Lisp, mainstream now in Clojure, Scala, Haskell…
Other major languages add-on “FP” :
1. Groovy : memoization : ability of the runtime to cache function return values automatically),
2. Java 8 : Lambda blocks ie. higher-order functions.
3. JavaScript: numerous functional features,
4. C++: lambda blocks in 2011 standard, including Boost.Phoenix library
Complect: to join by weaving and twining together : Interweave. (Rich Hickey 《Simple Made Easy》)
Michael Feathers , author of 《Working With Legacy Codes》 in Twitter:
“OO makes code understandable by encapsulating moving parts,
FP makes code understandable by minimizing moving parts. ”
“Moving Parts” are: variables scoping, visibility, mutable state.
OO controls them, FP eliminates them by Immutability data.
Clojure ‘s Selling Point : removes concurrency concern from developers just as Java JVM removes garbage collection concern (by automating it).
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