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docs: to Discriminated Unions from Contextual typing #114 #160

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docs: to Discriminated Unions from Contextual typing
Aug 22, 2020
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docs: fix text
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Update pages/tutorials/ts-for-functional-programmers.md
annkimm Sep 5, 2020
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Update pages/tutorials/ts-for-functional-programmers.md 
Co-authored-by: Seohee Park <dvlprsh103@gmail.com>
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@annkimm @dvlprsh
annkimm and dvlprsh authored Sep 5, 2020
commit 400f28df92eed8dd1123a8147c52b510a440bdc6
6 changes: 3 additions & 3 deletions pages/tutorials/ts-for-functional-programmers.md
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Expand Up @@ -312,11 +312,11 @@ declare function map<T, U>(f: (t: T) => U, ts: T[]): U[];
let sns = map((n) => n.toString(), [1, 2, 3]);
```

여기에 예시인 `n: number` 에서 또한, `T` 과 `U`는 호출 전이라서
여기에서, 이 예시의 `n: number`에서 또한, `T` 과 `U`는 호출 전에
추론되지 않았음에도 불구하고.
실제로 `[1,2,3]` 으로 `T=number`을 추론한 다음에,
`n => n.toString()`의 리턴 타입으로 `U=string`을 추론하며,
`sns` 가 `string[]` 타입을 가지도록 합니다.
`n => n.toString()`의 리턴 타입으로 `U=string`을 추론하여,
`sns`가 `string[]` 타입을 가지도록 합니다.

추론은 어떤 순서로든 동작하겠지만, intellisense은 왼쪽에서 오른쪽으로만
동작하고, 그래서 TypeScript는 먼저 배열과 함께 `map` 선언하는 것을
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