Coding Planet

const mapStateToProps = state => { const weatherData = state.home.weatherData || {}; return { temperature: weatherData.temperature, humidity: weatherData.humidity, windSpeed: weatherData.wind_speed, description: weatherData.description, };};   const weatherData = state.home.weatherData || {};이 구문은 JavaScript에서 흔히 사용하는 단축 평가(Short-circuit Evaluation) 문법이다.이 표현식은 state.home.weatherD..