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![© 1999-2017 Erlang Solutions Ltd 22
Lambdas & Closures
double([H|T]) ->
[H*2|double(T)];
double([]) ->
[].
bump([H|T]) ->
[H+1 | bump(T)];
bump([]) ->
[].
map(Fun, [H|T]) ->
[Fun(H)|map(Fun,T)];
map(_Fun, []) ->
[].
double(L) ->
map(fun(X)-> X*2 end,L).
bump(L) ->
map(fun(X)-> X+1 end,L).](https://image.slidesharecdn.com/concurrentlanguagesarefunctionalbyfrancescocesarini-171130105722/75/Concurrent-languages-are-Functional-by-Francesco-Cesarini-22-2048.jpg)
Uploaded byNaresh Jain
Concurrent languages are Functional by Francesco Cesarini
The document discusses concurrency in functional programming languages. It explains that there are two approaches to concurrency: mutable state and immutable state. Immutable state avoids issues with corrupt state that can occur with mutable state. Functional languages with immutable state and message passing, like Erlang, allow for easy distribution across computing resources from embedded devices to high-performance supercomputers. The document emphasizes how immutability, concurrency, and distribution enable scalability, reliability, and parallelism.
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Concurrent languages are Functional by Francesco Cesarini
- 1. © 1999-2017 ErlangSolutions Ltd Concurrent Languages are Functional Francesco Cesarini Founder & Technical Director @ Erlang Solutions @FrancescoC francesco@erlang-solutions.com
- 2. © 1999-2017 ErlangSolutions Ltd 2Source: Warner Bros
- 3. © 1999-2017 ErlangSolutions Ltd Two ways to do concurrency 3 Mutable State Immutable State Msg © 1999-2017 Erlang Solutions Ltd
- 4. © 1999-2017 ErlangSolutions Ltd 4
- 5. © 1999-2017 ErlangSolutions Ltd Y = X2-1 Immutability
- 6. © 1999-2017 ErlangSolutions Ltd Mutability X = X2-1
- 7. © 1999-2017 ErlangSolutions Ltd Mutability X = X2-1
- 8. © 1999-2017 ErlangSolutions Ltd 8 Corrupt State With Mutability
- 9. © 1999-2017 ErlangSolutions Ltd 9 Corrupt State With Mutability
- 10. © 1999-2017 ErlangSolutions Ltd 1 0 Corrupt State With Mutability
- 11. © 1999-2017 ErlangSolutions Ltd 11 Locality With Mutability Bangalore, India London, UK
- 12. © 1999-2017 ErlangSolutions Ltd Connectivity With Mutability 12 Bangalore, India London, UK
- 13. © 1999-2017 ErlangSolutions Ltd 13 Corrupt State With Immutability
- 14. © 1999-2017 ErlangSolutions Ltd 14 Corrupt State With Immutability
- 15. © 1999-2017 ErlangSolutions Ltd 15 Corrupt State With Immutability
- 16. © 1999-2017 ErlangSolutions Ltd 1 6 Locality With Immutability Bangalore, India London, UK
- 17. © 1999-2017 ErlangSolutions Ltd 1 7 Connectivity With Immutability Bangalore, India London, UK
- 18. © 1999-2017 ErlangSolutions Ltd Shared Memory 18 No Shared Memory Msg © 1999-2017 Erlang Solutions Ltd Two ways to do concurrency
- 19. © 1999-2017 ErlangSolutions Ltd
- 20. © 1999-2017 ErlangSolutions Ltd Source: Serious Eats
- 21. © 1999-2017 ErlangSolutions Ltd 21 Distribution
- 22. © 1999-2017 ErlangSolutions Ltd 22 Lambdas & Closures double([H|T]) -> [H*2|double(T)]; double([]) -> []. bump([H|T]) -> [H+1 | bump(T)]; bump([]) -> []. map(Fun, [H|T]) -> [Fun(H)|map(Fun,T)]; map(_Fun, []) -> []. double(L) -> map(fun(X)-> X*2 end,L). bump(L) -> map(fun(X)-> X+1 end,L).
- 23. © 1999-2017 ErlangSolutions Ltd 23 Parallella Board Dual core ARM processor + Epiphany 16/64 core co-processor, FPGA Raspberry Pi 2 Quad core ARM processor, GPU © 1999-2017 Erlang Solutions Ltd From Embedded Devices…
- 24. © 1999-2017 ErlangSolutions Ltd© 1999-2017 Erlang Solutions Ltd 24 ● 93 petaflops/s (November 2016) ● 40,960 Nodes, each with 2 Ivy Bridge multicores and 3 Xeon Phis ● 3,120,000 x86 cores in total Sunway TaihuLight Chinese National University of Defence Technology To the Fastest Computer in the World!
- 25. © 1999-2017 ErlangSolutions Ltd 25
- 26. © 1999-2017 ErlangSolutions Ltd Concurrency + Distribution Immutability Concurrency Distribution
- 27. © 1999-2017 ErlangSolutions Ltd Concurrency + Distribution Immutability Concurrency Distribution Multi-core Parallelism
- 28. © 1999-2017 ErlangSolutions Ltd Concurrency + Distribution Immutability Concurrency Distribution Multi-core Parallelism Scalability Reliability
- 29. © 1999-2017 ErlangSolutions Ltd Distribution Bangalore, India London, UK
- 30. © 1999-2017 ErlangSolutions Ltd Distribution Bangalore, India London, UK
- 31. © 1999-2017 ErlangSolutions Ltd Distribution Synchronous Asynchronous At the Most Once Exactly Once At Least Once Sequential Parallel
- 32. © 1999-2017 ErlangSolutions Ltd 32
- 33. © 1999-2017 ErlangSolutions Ltd 33 “Programming consists of overcoming two things: accidental difficulties, things which are difficult because you happen to be using inadequate programming tools, and things which are actually difficult, which no programming tool or language is going to solve.” - Joel Spolsky Questions?
- 34. © 1999-2017 ErlangSolutions Ltd Francesco Cesarini Founder & Technical Director @ Erlang Solutions @FrancescoC francesco@erlang-solutions.com