Everyday Functional Programming in JavaScript
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The document is a presentation about everyday functional programming in JavaScript. It discusses how functional programming uses functions as atomic units with known input/output behavior rather than objects. Immutable data is preferred to simplify parallel processing and declarative code is easier to read. The presenter will do a live coding demo covering concepts like unit testing, refactoring, function composition, currying, data immutability, and using high order functions instead of loops.
Everyday Functional Programming in JavaScript
- 1. Everyday Functional Programming in JavaScript Leo Hernandez @leojh
- 2. About Me ● From South Florida ● Been developing since 2004 ● Started out in .Net but now mostly JavaScript ● Really excited about JavaScript world and newer ways of doing the same thing @leojh
- 3. WHY? @leojh
- 4. In Functional Programming code is built by using Functions as atomic units @leojh
- 5. Functions are good atomic units because they have a known input -> output lifecycle @leojh
- 6. Unlike Objects, they tend to be simple and have no side effects @leojh
- 7. const square = x => x^2 @leojh
- 8. In Functional Programming, data is supposed to be immutable @leojh
- 9. Data Immutability helps with keeping things simple and with parallel processing @leojh
- 10. Part of the goal is to make the code declarative so it’s easier to read since it conveys intention @leojh
- 11. const myBestCustomers = customers => customersWhoBuyATonFromMe(customers) .and .giveMeGoodReviewsOnYelp(customers) @leojh
- 12. You’re probably already working in FP and may not realize it @leojh
- 13. If you’re using React, you’re basically using a plain JS Function to render things on a screen @leojh
- 14. const ArticleTitle = title => <h3>{title}</h3> @leojh
- 15. Let’s do some live coding @leojh
- 16. Concepts During Live Coding ● Unit Testing ● Refactoring ● Function Composition ● Curry ● Data Immutability and transformation / projections ● ES6+ @leojh
- 19. Before you write any traditional loop, ask yourself why? You should probably use a High Order Function instead @leojh