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like-dislike buttons. Created with create-react-app
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import React, { Component } from "react"; | |
import "./App.css"; | |
const reduceOne = (prevState, groupName, otherGroupName) => { | |
prevState[groupName].wasClicked | |
? prevState[groupName].count = prevState[groupName].count - 1 | |
: prevState[groupName].count = prevState[groupName].count + 1; | |
prevState[groupName].wasClicked = !prevState[groupName].wasClicked; | |
if (prevState[otherGroupName].wasClicked) { | |
prevState[otherGroupName].count = prevState[otherGroupName].count - 1; | |
prevState[otherGroupName].wasClicked = false; | |
} | |
return prevState; | |
}; | |
const reducer = action => | |
(prevState, props) => | |
action.type === "TOGGLE_LIKE" | |
? reduceOne(prevState, "like", "dislike") | |
: reduceOne(prevState, "dislike", "like"); | |
class App extends Component { | |
state = { | |
like: { | |
count: 0, | |
wasClicked: false, | |
}, | |
dislike: { | |
count: 0, | |
wasClicked: false, | |
}, | |
}; | |
toggleLike = () => this.setState(reducer({ type: "TOGGLE_LIKE" })); | |
toggleDislike = () => this.setState(reducer({ type: "TOGGLE_DISLIKE" })); | |
render() { | |
return ( | |
<div className="App"> | |
<header className="App-header"> | |
<h1 className="App-title">Like - Dislike</h1> | |
</header> | |
<p className="App-intro"> | |
<button className="like-button" onClick={this.toggleLike}> | |
Like | {this.state.like.count} | |
</button> | |
<button className="dislike-button" onClick={this.toggleDislike}> | |
Dislike | {this.state.dislike.count} | |
</button> | |
</p> | |
</div> | |
); | |
} | |
} | |
export default App; |
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