Created
August 26, 2019 07:43
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REDUX In REACT
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import React, { Component } from "react"; | |
import { connect } from "react-redux"; | |
class App extends Component { | |
render() { | |
return ( | |
<> | |
<h1>age {this.props.age}</h1> | |
<button onClick={this.props.onAgeUp}>increment age</button> | |
<button onClick={this.props.onAgeDown}>decrement age</button> | |
</> | |
); | |
} | |
} | |
const mapDispatchToProps = dispatch => { | |
return { | |
onAgeUp: () => dispatch({ type: "AGE_UP" }), | |
onAgeDown: () => dispatch({ type: "AGE_DOWN" }) | |
}; | |
}; | |
const mapStateToProps = state => { | |
return { | |
age: state.age | |
}; | |
}; | |
export default connect( | |
mapStateToProps, | |
mapDispatchToProps | |
)(App); |
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import React from "react"; | |
import ReactDOM from "react-dom"; | |
import "./index.css"; | |
import App from "./App"; | |
import * as serviceWorker from "./serviceWorker"; | |
import { Provider } from "react-redux"; | |
import { createStore } from "redux"; | |
import reducers from "./store/reducer"; | |
const store = createStore(reducers); | |
ReactDOM.render( | |
<Provider store={store}> | |
<App /> | |
</Provider>, | |
document.getElementById("root") | |
); | |
// If you want your app to work offline and load faster, you can change | |
// unregister() to register() below. Note this comes with some pitfalls. | |
// Learn more about service workers: https://bit.ly/CRA-PWA | |
serviceWorker.unregister(); |
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const initialState = { | |
age: 21 | |
}; | |
const reducer = (state = initialState, action) => { | |
const newState = { ...state }; | |
switch (action.type) { | |
case "AGE_UP": | |
newState.age++; | |
break; | |
case "AGE_DOWN": | |
newState.age--; | |
break; | |
default: | |
break; | |
} | |
return newState; | |
}; | |
export default reducer; |
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