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---
id: children-props-type-ko-KR
title: 자식 속성들의 타입
layout: tips
Upgrade to Jekyll 3 Full list of changes is at https://jekyllrb.com/docs/upgrading/2-to-3/. The tl;dr of it is: - Relative permalinks were removed, so all the files in the `docs` subdirectory need their permalink to be prefixed with `docs/` - `post` and `page` types were renamed to `posts` and `pages` respectively - `jekyll-paginate`, `pygments` and `redcarpet` are all now optional, so I needed to explicitly add it to the Gemfile. Jekyll now uses `rouge` rather than `pygments` for syntax highlighting, but rouge does not support highlighting individual lines (`hl_lines`) so we need to continue using Pygments. - Layout metadata (eg. `sectionid`) is now on a `layout` variable rather than `page` Tested the following pages and confirmed that they all work: - "Docs" link (getting started page): http://127.0.0.1:4000/react/docs/getting-started.html - Downloads: http://127.0.0.1:4000/react/downloads.html - Tutorial: http://127.0.0.1:4000/react/docs/tutorial.html - A few pages under the "docs" subdirectory, to confirm they're working properly: - http://127.0.0.1:4000/react/docs/addons.html - http://127.0.0.1:4000/react/docs/why-react.html - http://127.0.0.1:4000/react/docs/create-fragment.html - A few tips: - http://127.0.0.1:4000/react/tips/false-in-jsx.html - http://127.0.0.1:4000/react/tips/style-props-value-px.html - Non-English versions of the page: - http://127.0.0.1:4000/react/docs/getting-started-it-IT.html - http://127.0.0.1:4000/react/docs/getting-started-ja-JP.html
9 years ago
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---
컴포넌트의 자식들(`this.props.children`)은 대부분 컴포넌트의 배열로 들어갑니다:
```js
var GenericWrapper = React.createClass({
componentDidMount: function() {
console.log(Array.isArray(this.props.children)); // => true
},
render: function() {
return <div />;
}
});
ReactDOM.render(
<GenericWrapper><span/><span/><span/></GenericWrapper>,
mountNode
);
```
하지만 자식이 하나만 있는 경우, `this.props.children`_배열 래퍼(wrapper)없이_ 싱글 자식 컴포넌트가 됩니다. 이렇게 함으로써 배열 할당을 줄일 수 있습니다.
```js
var GenericWrapper = React.createClass({
componentDidMount: function() {
console.log(Array.isArray(this.props.children)); // => false
// 경고 : 산출된 5 값은 'hello' 스트링의 길이 입니다. 존재하지 않는 배열 래퍼의 길이인 1이 아닙니다!
console.log(this.props.children.length);
},
render: function() {
return <div />;
}
});
ReactDOM.render(<GenericWrapper>hello</GenericWrapper>, mountNode);
```
`this.props.children`을 쉽게 다룰 수 있도록 [React.Children utilities](/react/docs/top-level-api-ko-KR.html#react.children)를 제공하고 있습니다.