Functional Approach to Software Engineering
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Functional Approach to Software Engineering
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Functional Approach to Software Engineering
- 3. Outline - Pure functions - Shared Mutable State - Null - Monads - Example use cases in JavaScript
- 4. Pure Functions ○ No Mutations ○ No Side effects
- 9. No difference between the value and the reference to a piece of data Referential Transparency
- 10. This is not referential transparency
- 11. Null
- 12. Maybe Null
- 13. Monads
- 14. Monads In simple terms -- supports Map obj.map(f).map(g) == obj.map(g~f) -- pointed -- A way to lift values Containers with functionality that supports associativity and identity ○ Arrays ○ Promises ○ And much more
- 15. Examples
Notas del editor
- https://jsbin.com/cihapuf/edit?js,output
- There are two ways to get a value out of a function -- Return path -- Exception path
- Javascript is safe in most of the cases since it is single threaded. Think of this in Java terms Mutual exclusions Dead locks / Starvation Even in Javascript if you have concurrent browser tabs accessing network or local storage
- Most of these act like Monads.