Underscore
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The document discusses issues with using Underscore.js for functional programming concepts like currying, composition, and functors. Specifically, it notes that Underscore's API prevents currying functions and extending the map method, promoting chain over composition. The document suggests using Wu.js instead for a more functional approach.
Underscore
- 1. “Hey Underscore, You’re doing it wrong” You’re doing it wrong”
- 2. I <3 _
- 3. So what’s wrong then?
- 5. Agenda • Currying • Composition • Functors • Random stuff
- 6. Currying
- 7. Curried Function “A function that will return a new function until it receives all it’s arguments”
- 11. ...weird
- 12. Wu.js to the rescue! (well, one function at least) (well, one function at least)
- 15. not weird
- 24. Example
- 25. 0 0 Example Functional Underscore
- 26. 1 0 Example Functional Underscore
- 27. 2 0 Example Functional Underscore
- 28. 3 0 Example Functional Underscore
- 29. underscore’s api prevents you from currying
- 31. Currying • Make generic functions - data is gone • Build new functions by applying args • Much more concise definitions • Make types “line up” for composition
- 32. Composition
- 41. Category Theory “The mathematical theory of transforming values and crap” *inaccurate definition
- 45. Example
- 46. 3 0 Example Functional Underscore
- 47. 4 0 Example Functional Underscore
- 48. 5 0 Example Functional Underscore
- 50. underscore promotes chain as the function of choice.
- 52. Composition • Build new functions from other functions • Helps build generic programs w/o args • Extremely high level coding • Mathematically backed
- 53. Functors
- 68. Example
- 69. 5 0 Example Functional Underscore
- 70. 6 0 Example Functional Underscore
- 71. 7 0 Example Functional Underscore
- 72. underscore explicitly prevents extending map
- 74. s • Change behavior without altering function open/closed principle • Not just map - reduce, compose, etc • Intuition and “non proprietary” api • Free formulas • Dynamic type safety?
- 75. In conclusion