Functional programming
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The seminar on functional programming focuses on sharing insights and building a community rather than traditional lecture formats. It explains the key concepts of functional programming, emphasizing immutability, first-class functions, and the distinction between pure and impure functions. The document also highlights declarative programming's nature, contrasting it with procedural programming, and mentions various programming languages that embody these principles.
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Functional programming
- 2. What a seminar (at least mine) isn’t … A lecture A tutorial A
- 3. What a seminar (at least mine) is about Sharing ‘Aha’ moments Building a vibrant community
- 4. About Me A CEO A web application developer An expert in Functional programming.
- 5. What is FP? A programming paradigm A coding style A mindset A hype
- 6. Closures Currying Higher-Order-Functions Side-effects Lambda expressions Reduce , filter, map BUZZ WORDS
- 7. What FP is not … A procedural programming All about creating functions and using them
- 9. Basic FP Concepts Functions as a first-class-citizens Immutable values over mutable variables Currying, partial application of functions Laziness, deferred execution Avoiding side-effects DRY Thinking Functional
- 10. ” “A first-class citizen : an entity which supports all the operations generally available to other entities. These operations typically include being passed as an argument, returned from a function, and assigned to a variable. SCOTT, MICHAEL (2006). PROGRAMMING LANGUAGE PRAGMATICS Demo Thinking Functional
- 11. Side-effects a function or expression is said to have a side effect if it modifies some state or has an observable interaction with calling functions or the outside world. For example, a particular function might modify a global variable or static variable, modify one of its arguments, raise an exception, write data to a display or file, read data, or call other side-effecting functions. In the presence of side effects, a program's behaviour may depend on history; that is, the order of evaluation matters. Understanding and debugging a function with side effects requires knowledge about the context and its possible histories. Thinking Functional
- 12. Pure vs Impure The function always evaluates the same result value given the same argument value(s). The function result value cannot depend on any hidden information or state that may change while program execution proceeds or between different executions of the program, nor can it depend on any external input from I/O devices. Evaluation of the result does not cause any semantically observable side effect or output, such as mutation of mutable objects or output to I/O devices. Pure: sin(x) Impure: random()
- 13. Code reuse (DRY) demo
- 14. Don’t iterate MAP, REDUCE, FILTER
- 15. Declarative programming Declarative programming: A style of building the structure and elements of computer programs — that expresses the logic of a computation without describing its control flow. E.g: Database query languages (e.g., SQL), regular expressions, logic programming (e.g., Prolog), functional programming.
- 16. Iteration TheArray<String>[] = { “GoT”,”BrBa”,”Zemen”}; for(int i=0;i<TheArray.size();i++){ System.out.println(“I’ve watched ”+TheArray[i]); }
- 17. Map, reduce , filter, lambda Demo
- 18. Implementing
- 19. Languages Pure Haskell Curry Not-pure Clojure F# Scala JavaScript Java8
- 20. Excuses This is my very first seminar. Internet