learn:functional-programming
目錄表
Functional Programming 筆記
Library
值 vs Functor
| f | g | composition |
|---|---|---|
| pure | pure | compose(f, g) |
| effects | pure(unary) | f.map(g) |
| effects | pure(n-ary) | f1.map(g).ap(f2) |
| effects | effects | m.chain(f).chain(g) |
Functor
| ADT | Effect |
|---|---|
| Either | 處理錯誤情境 |
| Future | #TODO |
| Identity | #TODO |
| IO | 處理永不失敗的同步計算 |
| Maybe | 處理無值情境 |
| Reader | #TODO |
| Tuple | #TODO |
| State | #TODO |
Either
- 處理錯誤情境
- 分成
Either.Right和Either.Left Either.Right會繼續跑，而Either.Left則會忽略後續運算，執意將手上的值傳下去
- snippet.javascript
const addOne = num => Right(R.add(1)); const error = () => Left(new Error('error')) Right(10) .chain(addOne) .map(R.add(2)) .inspect() // Right(13) Right(10) .chain(error) .map(R.add(2)) .inspect() // Left(Error: error)
Future
TODO
Identity
TODO
IO
- 處理永不失敗的同步計算
Maybe
- 處理無值情境 ( null || undefined )
Reader
- 用來避免中間傳送無用的
dep
Tuple
TODO
State
* <https://ithelp.ithome.com.tw/articles/10280554>
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learn/functional-programming.txt · 上一次變更: 2022/06/21 08:47 由 admin_wi1d5ky