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Functional Programming Pete Graham @petexgraham My Functional - PowerPoint PPT Presentation

Apr 02, 2024 •383 likes •559 views

Functional Programming Pete Graham @petexgraham My Functional Programming Timeline Learned Haskell at University. Forgot it. Something strange happened... Functional Programming Renaissance 1. What is it? 2. Why learn Functional

  1. Functional Programming Pete Graham @petexgraham

  2. My Functional Programming Timeline ● Learned Haskell at University. ● Forgot it. ● Something strange happened...

  3. Functional Programming Renaissance 1. What is it? 2. Why learn Functional Programming? 3. What is it good for? 4. Who is using it?

  4. What is Functional Programming? 1 Not Imperative Programming.

  5. What is Functional Programming? 2 ● A language with first-class functions. ● This culminates in the use of higher-order functions such as map and reduce.

  6. What is Functional Programming? 3 ● Functional programming involves writing code that does not change state. ● Successive calls to a function will yield the same result. ● Minimises and controls side effects including mutation.

  7. What is Functional Programming? 4 Functional programming is like describing your problem to a mathematician. Imperative programming is like giving instructions to an idiot. http://community.schemewiki.org/?scheme- fortune-cookies

  8. Technically Functional Programming! ● Excel Formulas ● SQL ● Logo

  9. Why learn Functional Programming? ● “You should learn a new language each year.” The Pragmatic Programmer ● New paradigm so gives you different ways to solve problems. ● The new “Python paradox”

  10. What is Functional Programming good for? Characteristics: 1. Immutability leads to "No side effects". 2. Concise elegant code. 3. Concurrency. 4. Parallelism. Working hard to keep things simple

  11. Who is using Functional Programming? ● Twitter: Scala ● The Guardian: Scala ● Amazon: Clojure ● Facebook: Haskell ● WhatsApp: Erlang

  12. Where is FP used in the stack? ● Passed from traditional backend code via task queue. ● See The clean architecture for more info. ● “Imperative shell that wraps and uses your functional core”

  14. Pure Functional Languages ● Haskell ● A load of others I’ve never heard of

  15. Multi-paradigm Languages ● Scala ● JavaScript? ● Clojure ● Python? ● Erlang ● Java? ● LISP

  16. Finally some code! Sum of 1 to 9 Python Imperative Python Functional total = 0 sum(range(1, 10)) for i in range(1, 10): Haskell Functional total += i sum [1..10]

  17. How to learn Functional Programming Coursera Functional learnyouahaskell.com Programming Principles in Scala

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