> For the complete documentation index, see [llms.txt](https://s-organization-65.gitbook.io/harrys-note/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://s-organization-65.gitbook.io/harrys-note/week-8/props-attrs.md).

# 5. props-attrs

[style 연습](https://github.com/heyho00/style-lec)

## 활성화 여부를 표현하거나, 특정 스타일을 잡아주고 싶을 때 유용함.

```js
import { useBoolean } from "usehooks-ts";

import styled, { css } from "styled-components";

type ParagraphProps = {
  active?: boolean,
};

const Paragraph =
  styled.p <
  ParagraphProps >
  `
 color: ${(props) => (props.active ? "#F00" : "#888")};
 ${(props) =>
   props.active &&
   css`
     font-weight: bold;
   `}
`;

export default function Greeting() {
  const { value: active, toggle } = useBoolean(false);

  return (
    <div>
      <Paragraph>Inactive</Paragraph>
      <Paragraph active>Active</Paragraph>
      <Paragraph active={active}>
        Hello, world{" "}
        <button type="button" onClick={toggle}>
          Toggle
        </button>
      </Paragraph>
    </div>
  );
}
```

## 속성 추가

기본 속성을 추가할 수 있음. 불필요하게 반복되는 속성을 처리할 때 유용한데, 버튼 등을 만들 때 적극 활용함.

```js
import styled from "styled-components";

const Button = styled.button.attrs({
  type: "button",
})`
  border: 1px solid #888;
  background: transparent;
  cursor: pointer;
`;

export default Button;
```