Dmitry Preeternal's questions

下午好，您需要在计算组件中从商店中提取道具，并将计算结果与它一起传递给应用程序

应用程序.js

    import React, { Component } from 'react'; 
    import { connect } from 'react-redux';
    import principalChanged from './src/actions';
    import  Input from './src/components/common';
    import  { principal2, principal3 } from './src/components/calculate';

      class App extends Component {
        onPrincipalChange(text) {           
          this.props.principalChanged(text); 
        }
      render() {
        return ( 
            <Card>
               <Input 
                 placeholder="Placeholder" 
                 label="Label" 
                 onChangeText={this.onPrincipalChange.bind(this)} 
                 value={this.props.principal}                      
                />
              `Текущее состояние переменной: ${this.props.principal}`{/n}
              `Новая переменная: ${principal2}`
              `Новая переменная: ${principal3}`
            </Card>
        );
       }
       }
const mapStateToProps = state => { 
   return { 
      principal: state.form.principal
   }; 
}; 
export default connect(mapStateToProps, { 
    principalChanged 
})(App);

计算.js

// вызов переменной principal из store
// каким то образом
export const principal2 = (principal) => {     
     return ( { principal * 2 } ); // вычисления 
}; 

export const principal3 = (principal) => {     
     return ( { principal / 2 } ); // вычисления
};