Do polymorphism not classes

Classes are mechanism for polymorphic dispatch with lot's of issues. Maybe we should just use polymorphism & forget about classes.

Transcript

1. Do polymorphism not classes
2. Software engineering is full of bullshit!!
3. Software is all about taking input data, transforming and writing it to output
4. Software engineering is full of bullshit!!
5. Best example: Classes
6. Software is all about data transformation input / output
7. Not about Dog that can .bark() or .jump()
8. Why OOP Sucks! Joe Armstrong http://www.sics.se/~joe/bluetail/vol1/v1_oo.html • It was thought to be easy to learn. • It was thought to make code reuse easier. • It was hyped • It created a new software industry.
9. • Designed with perfect world in mind. • Have expression problem. • Mixing data with functions http://en.wikipedia.org/wiki/Expression_problem Classes
10. Classes are mechanism for polymorphic dispatch
11. Classes are mechanism for polymorphic dispatch + Lots of issues
12. Polymorphism way to handle values of different data types using a uniform interface.
13. Forget about Classes just do polymorphism
14. Think in data abstractions Readable Writable Observable Countable Iteraeable
15. Define data types that comply to abstractions Stream Buffer View EventEmitter List maybe multiple
16. Define functions that operate on your data abstractions dispatch count observe write read reduce map filter
17. https://github.com/Gozala/method 53 Lines of code
18. Define abstraction var isWatchable = Method() var watchers = Method()
19. Define types function Watchable() { this.watchers = [] }
20. Implement functions that operate on abstraction isWatchable.define(Watchable, function() { return true }) watchers.define(Watchable, function() { return this.watchers })
21. Enjoy writing simple functions function watch(value, fn) { if (isWatchable(value) watchers(watchable).push(fn) }
22. Support new types isWatchable.define(Object, function() { return false }) isWatchable({}) // => false isWatchable(new Watchable) // => true
23. Thanks https://github.com/Gozala/method @gozala