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React Hooks Single State
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| import React, { useState } from 'react'; | |
| const todo = props => { | |
| const [userState, setUserState] = useState({ | |
| userName: '', | |
| userList: [], | |
| }); | |
| const inputChangeHandler = event => { | |
| setUserState({ | |
| userName: event.target.value, | |
| userList: userState.userList, | |
| }); | |
| }; | |
| const userAddHandler = () => { | |
| setUserState({ | |
| userName: userState.userName, | |
| userList: userState.userList.concat(userState.userName), | |
| }); | |
| }; | |
| return ( | |
| <React.Fragment> | |
| <input type="text" placeholder="Add user" onChange={inputChangeHandler} value={userState.userName} /> | |
| <button type="button" onClick={userAddHandler}> | |
| Add | |
| </button> | |
| <ul> | |
| {userState.userList.map(user => ( | |
| <li key={user}>{user}</li> | |
| ))} | |
| </ul> | |
| </React.Fragment> | |
| ); | |
| }; | |
| export default todo; | |
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