The power of composition

on YouTube ↗01h 01m

" summary

Argues composition builds large systems from tiny, testable pieces and demonstrates it with C# and F# code: Roman numerals via a pipeline, FizzBuzz using a two-track bind (monads) pattern that handles divisibility by 3, 5 and 15, and an object-free web app built on Giraffe/ASP.NET that composes handlers. Shows practical tools: pipe operator, currying and partial application (F# gives currying for free), and Kleisli composition to join async/optional flows; the examples compile and run, illustrating one-way data flow and easy extension.

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" chapters (12)

1. 0:00Introduction and welcome
2. 1:56Philosophy behind composition
3. 7:11Functional programming basics
4. 15:13Composing functions with piping
5. 22:59Composing types in functional programming
6. 25:05Roman numerals example with composition
7. 36:56Currying and partial application
8. 41:07FizzBuzz with monads and bind
9. 50:55Monads demystified
10. 53:41Kleisli composition for web services
11. 58:12Benefits of composition in programming
12. 1:00:38Q&A and closing remarks

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