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translate "Checks For Equality on NaN" in ko #185

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Dec 14, 2022
Merged

translate "Checks For Equality on NaN" in ko #185

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f8d0e8a
translate "Checks For Equality on NaN"
Dec 9, 2022
d8e779c
delete useless expression
bumkeyy Dec 9, 2022
c955628
Update TypeScript 4.9.md
bumkeyy Dec 14, 2022
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24 changes: 12 additions & 12 deletions docs/documentation/ko/release-notes/TypeScript 4.9.md
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Original file line number Diff line number Diff line change
Expand Up @@ -253,12 +253,12 @@ class Person {

You can [read up more about the auto-accessors pull request on the original PR](https://github.com/microsoft/TypeScript/pull/49705).

## Checks For Equality on `NaN`
## `NaN` 동등성 검사

A major gotcha for JavaScript developers is checking against the value `NaN` using the built-in equality operators.
JavaScript 개발자의 주요 문제는 내장된 동등 연산자를 사용해서 `NaN` 값을 확인하는 점입니다.

For some background, `NaN` is a special numeric value that stands for "Not a Number".
Nothing is ever equal to `NaN` - even `NaN`!
`NaN`은 특수 숫자 값으로 "Not a Number"를 의미합니다.
`NaN`과 동일한 것은 없습니다. 심지어 `NaN`도 마찬가지입니다.

```js
console.log(NaN == 0) // false
Expand All @@ -268,7 +268,7 @@ console.log(NaN == NaN) // false
console.log(NaN === NaN) // false
```

But at least symmetrically *everything* is always not-equal to `NaN`.
하지만 적어도 대칭적으로 *모든 것* 은 항상 `NaN`과 동일하지 않습니다.

```js
console.log(NaN != 0) // true
Expand All @@ -278,11 +278,11 @@ console.log(NaN != NaN) // true
console.log(NaN !== NaN) // true
```

This technically isn't a JavaScript-specific problem, since any language that contains IEEE-754 floats has the same behavior;
but JavaScript's primary numeric type is a floating point number, and number parsing in JavaScript can often result in `NaN`.
In turn, checking against `NaN` ends up being fairly common, and the correct way to do so is to use [`Number.isNaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN) - *but* as we mentioned, lots of people accidentally end up checking with `someValue === NaN` instead.
IEEE-754 float를 포함하는 모든 언어가 동일하게 동작하므로, 기술적으로 JavaScript만의 문제는 아닙니다.
JavaScript의 기본 숫자 타입은 부동소수점 숫자이며, JavaScript는 숫자 구문을 종종 `NaN`으로 분석할 수 있습니다.
그러므로 `NaN` 값 확인은 일반적이며, [`Number.isNaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN)를 사용하면 올바르게 확인할 수 있습니다. 하지만 위에서 언급했듯이 많은 사람들이 실수로 `someValue === NaN`을 사용해서 확인하게 됩니다.

TypeScript now errors on direct comparisons against `NaN`, and will suggest using some variation of `Number.isNaN` instead.
TypeScript는 이제 `NaN` 값을 직접 비교하면 오류를 보여주고 `Number.isNaN` 사용을 제안합니다.

```ts
function validate(someValue: number) {
Expand All @@ -293,9 +293,9 @@ function validate(someValue: number) {
}
```

We believe that this change should strictly help catch beginner errors, similar to how TypeScript currently issues errors on comparisons against object and array literals.
이번 변경은 TypeScript가 현재 객체 및 배열 리터럴에 대한 비교에서 오류를 발생시키는 방식과 유사하게, 초보자 오류를 잡는 데 큰 도움이 될 것이라고 믿습니다.

We'd like to extend our thanks to [Oleksandr Tarasiuk](https://github.com/a-tarasyuk) who [contributed this check](https://github.com/microsoft/TypeScript/pull/50626).
[이 기능에 기여한](https://github.com/microsoft/TypeScript/pull/50626) [Oleksandr Tarasiuk](https://github.com/a-tarasyuk)에게 감사를 전하고 싶습니다.

## File-Watching Now Uses File System Events

Expand Down Expand Up @@ -498,4 +498,4 @@ For more information, [see this pull request](https://github.com/microsoft/TypeS

As part of an optimization on substitution types, `SubstitutionType` objects no longer contain the `substitute` property representing the effective substitution (usually an intersection of the base type and the implicit constraint) - instead, they just contain the `constraint` property.

For more details, [read more on the original pull request](https://github.com/microsoft/TypeScript/pull/50397).
For more details, [read more on the original pull request](https://github.com/microsoft/TypeScript/pull/50397).