What is the process for linking read-only methods to Redux object instances?

Question

What is the process for linking read-only methods to Redux object instances?

Let's say I have a "user" object stored in redux, with fields for first name and last name (

interface User { firstName : string, lastName : string}

if using typescript). After retrieving a user from redux, I want to obtain the full name of the user by combining the first and last names:

${user.firstName} ${user.lastName}

. Currently, I have a function:

function getFullName(user: User) : string { 
  return `${user.firstName} ${user.lastName}`
}

In my application, I have several similar read-only functions like this one. I would prefer to have a method that can be called as user.getFullName() or even user.fullName. This way, I wouldn't need to import multiple functions separately or distinguish between properties and functions.

I could achieve this by creating class objects every time data is retrieved from redux and ensuring to use {...user} when saving back to redux to convert it into a plain JavaScript object. However, this approach would introduce additional boilerplate code, especially when using typescript in combination with redux.

This issue seems like something that should have a straightforward solution. Is there a simple and efficient way to tackle this problem?

javascript typescript redux

Answer 1

Answer №1

Member methods within JS objects are treated in the same way as other properties. This means that you can define a member method getFullName() on the User interface and implement it within the initalUserState. The getFullName() method will persist even after the redux action is processed.

interface User {
    firstName: string; lastName: string;
    getFullName: () => string;
}

const initialState: User = {
    firstName: '',
    lastName: '',
    getFullName () {
        return `${this.firstName} ${this.lastName}`;
    },
}

const reducer: Reducer<User, Action> = (state = initialState, action): User => {
    // logic to handle actions
    return state;
}

The spread syntax

{ ...state, firstName: action.firstName }

will still function correctly without overwriting the getFullName() method.

Within a component, you can utilize the getFullName() method as demonstrated below

const Component1: FC<User> = (user) => <div>{user.getFullName()}</div>

export default connect<User, {}, {}, ApplicationState>
    (state => state.user, null)(Component1)

Answer 2

Member methods within JS objects are treated in the same way as other properties. This means that you can define a member method getFullName() on the User interface and implement it within the initalUserState. The getFullName() method will persist even after the redux action is processed.

interface User {
    firstName: string; lastName: string;
    getFullName: () => string;
}

const initialState: User = {
    firstName: '',
    lastName: '',
    getFullName () {
        return `${this.firstName} ${this.lastName}`;
    },
}

const reducer: Reducer<User, Action> = (state = initialState, action): User => {
    // logic to handle actions
    return state;
}

The spread syntax

{ ...state, firstName: action.firstName }

will still function correctly without overwriting the getFullName() method.

Within a component, you can utilize the getFullName() method as demonstrated below

const Component1: FC<User> = (user) => <div>{user.getFullName()}</div>

export default connect<User, {}, {}, ApplicationState>
    (state => state.user, null)(Component1)

What is the process for linking read-only methods to Redux object instances?

Answer №1

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