Reactとの連携３ - Qiita

// Run this example by adding <%= javascript_pack_tag 'hello_react' %> to the head of your layout file, // like app/views/layouts/application.html.erb. All it does is render <div>Hello React</div> at the bottom // of the page. import React from 'react' import ReactDOM from 'react-dom' import PropTypes from 'prop-types' const Calc = props => { let n = props.number; let total = 0; for (let i = 0;i <