Translate 1 file to ko - Keyof Type Operator.md

[bumkeyy]

0906747

리뷰 부탁드려요~

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @bumkeyy, @yeonjuan, @guyeol, and @dvlprsh - if they write a comment saying "LGTM" then it will be merged.

[github-actions]

Translation of Keyof Type Operator.md

---

title: Keyof Type Operator
layout: docs
permalink: /ko/docs/handbook/2/keyof-types.html

oneline: "Using keyof operators in a type context"

keyof Type operator

keyof The operator generates a number or string literal union of key values for an object in an object type.
The following type P is the "x" | It is the same type as "y".

type Point = { x: number; y: number };
type P = keyof Point;
//   ^?

If a type stringor number If you have an index signature, keyofreturns the type.

type Arrayish = { [n: number]: unknown };
type A = keyof Arrayish;
//   ^?

type Mapish = { [k: string]: boolean };
type M = keyof Mapish;
//   ^?

The highlight from the example above is Msilver string | numberit's a good idea. -- Because JavaScript object keys always force strings, obj[0]silver obj["0"]same as .

keyof Types are especially useful when used with mapped types that we will learn in the future.

Generated by 🚫 dangerJS against 0906747

[yeonjuan]

LGTM

[github-actions]

Merging because @yeonjuan is a code-owner of all the changes - thanks!