score:2
Accepted answer
const nullcustomerentities = {
customer: "anonymous"
}
export const getselectedcustomer = state => state.systems.selectedcustomer;
export const getcustomerentities = state => {
return state.systems.entities[getselectedcustomer(state)] || nullcustomerentities;
}
export const getselectedcustomername = state => {
return getcustomerentities(state).customer;
}
this is a classic example of a null object pattern (hope you don't mind the code being in ruby).
Source: stackoverflow.com
Related Query
- React Redux - Conditional selector
- React Redux - How to access a structured selector from a static function?
- How to connect a React component to my Redux store using a selector that takes an argument in Typescript?
- React Redux : use Selector is called before dispatch
- What is the correct way to React Hook Fetch Api and store to Redux and retrieve it with Selector immediately?
- Pass Redux selector value to react state without rerendering in useEffect
- Conditional redirect in React after async redux call
- Conditional Rendering Redux and React
- React Redux get data from dynamic selector
- Redux Store fetch takes long, messing up a react component that uses conditional rendering | need data faster
- What is correct way to render conditional jsx when using redux with react
- React Redux action fires too many times after conditional is true
- react + redux + normalizer: How to send conditional denormalized data?
- React Redux how make conditional rendering with redux state
- What is the best way to access redux store outside a react component?
- Correct way to handle conditional styling in React
- Difference between component and container in react redux
- React + Redux - What's the best way to handle CRUD in a form component?
- Get version number from package.json in React Redux (create-react-app)
- React / Redux and Multilingual (Internationalization) Apps - Architecture
- React showing 0 instead of nothing with short-circuit (&&) conditional component
- How to show a loading indicator in React Redux app while fetching the data?
- When should I add Redux to a React app?
- React router redirect after action redux
- Where do I fetch initial data from server in a React Redux app?
- Firing Redux actions in response to route transitions in React Router
- How to CSS display:none within conditional with React JSX?
- React + Redux - Input onChange is very slow when typing in when the input have a value from the state
- When do I choose React state Vs Redux Store
- My Redux state has changed, why doesn't React trigger a re-render?
More Query from same tag
- n-th child selector not working in react map render function
- How React blocks UI updating in useLayoutEffect
- Validate string length and make sure it contains certain characters in React Redux Form
- Enzyme unit testing onChange method using Material UI Components
- React JS filter
- React-Bootstrap Badge is only white text no matter how I change its property. How to solve it?
- Set default value in State object in React Typescript
- Why does the name of the state object not need to match the name in setState?
- Get dimensions of mp4 on user upload reactjs
- TypeError: Cannot read property 'handleClick' of undefined
- Change boolean value onClick in React
- React: Unhandled Rejection (TypeError): firebase__WEBPACK_IMPORTED_MODULE_1__
- How to calculate the total price of items with button in React.js?
- how to fill chart bars width dynamically in Reactjs
- Can't update state array using hooks on findIndex condition
- React formik - how to run a function after setValues
- React Uncaught TypeError: this.setState is not a function
- How can I desctructure items out of an object that is returned from a React hook using Typescript?
- Render bar chart with chart.js and react and es6
- Redux Form: MapStateToProps is breaking form
- Reactjs + D3 v4 projection issue
- onVideoSelect vs onVideoSelected
- What happens when we use usestate without any parameters (in React hooks)?
- How to transform module after ordinary transform has run in jest
- How do i access state of one reducer in other in react redux. State flow between reducers and store
- React js react-dropzone remove file
- Assert that value from Context is not null in child component?
- Add a value to an object with its key depth based on an array
- React-Bootstrap Dropdown Button does not work as expected
- POST http://localhost:9000/ net::ERR_CONNECTION_REFUSED