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Introduction to functional programming with JavaScript
- 1. Introduction to Functional Programmingwith JavaScript
- 2. Introduction Farzaneh Orak Software Engineer HunterIndustries Mob programming
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- 4. FP and OOP Object-OrientedProgrammingFunctional Programming
- 5. JavaScript language • Multi-paradigm •First class function
- 6. Which one isbetter? • Depend on what are you trying to do • Michael Fogus author of “Functional Javascript” • Deal with data about people -> FP • Simulate people -> Object-Oriented Programming
- 7. When we usefunctional • People simulation • Shared state • Data about people • Avoid shared state
- 8. What is Functionalprogramming? • Programming paradigm • Style-organizing coding • Way of thinking • Express everything in term of functions • Declarative
- 9. Why functional programming? •Increase readability and maintainability • Function reusability • Easier testing and debug • Needs low brain power to read the code
- 10. Why functional programming? •Elegant code • Predictability • Less complex
- 11. Functional Programming principles •Avoid sharing state • Avoid side effect • Avoid data mutation
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- 13. Avoid side effect •Console log • Writing to a file
- 14. Avoid data mutation •Once object created it can’t be changed
- 15. Functional Programming Techniques •Pure function • Higher order function
- 16. Functional Programming principles •Pure functions • Given the same input, It always returns the same output
- 17. Impure vs Purefunctions
- 18. Pure functional- Avoidsharing state
- 19. Pure functional- Avoidside effect
- 20. Functional Programming Techniques •Higher order function • Function composition • Functions re-usability • Function currying
- 21. Functional Programming Techniques •Higher order functions • Pass functions as arguments or return functions
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- 25. Higher order functions •Map • Filter • Reduce
- 26. Map • Avoid datamutation
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- 28. Reduce • Higher orderfunction • Works on variety of datatype
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- 30. Filter • Avoid datamutation
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- 34. Trie data structure •Trie data structure • Structural sharing
- 35. Trie data structure 6242 64 5
- 36. Libraries • JFP • Ramda •Lodashfp • Mori • Immutable js
- 37. Recap • Functional ProgrammingPrinciples • Avoid shared state • Avoid side affect • Avoid data mutation • Functional Programming Techniques • Pure function • Higher order functions
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