Everyday Functional Programming in JavaScript
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This document summarizes a presentation on everyday functional programming in JavaScript. The presentation introduces functional programming concepts like using functions as atomic units with known input-output behavior, immutable data to help with simplicity and parallel processing, and declarative code to make intentions clear. It also discusses how many developers may already be using functional programming techniques without realizing it when using React and its function components to render views.
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- 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 JavaScipt world and newer ways of doing the same thing @leojh
- 3. WHY? @leojh
- 4. In Functional Programming the 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
- 18. Before you write any traditional loop, ask yourself why? @leojh