Assigning union values to an object array: a guide for Typescript

When working with union typed values in an object array, how should the setState() function be implemented?

enum SomeStateEnum {
  IsRunning,
  Name,
}

type PersonState = {
  [SomeStateEnum.IsRunning]: boolean;
  [SomeStateEnum.Name]: string;
};

const state: PersonState = {
  [SomeStateEnum.IsRunning]: false,
  [SomeStateEnum.Name]: 'John Doe',
};

function setState(key: SomeStateEnum, value: boolean | string) {
  state[key] = value;
}

https://i.sstatic.net/7BMsH.png

Answer №1

It is essential to ensure that the value you are setting matches the data type of the key.

function updateState<T extends CustomStateType>(identifier: T, newValue: StateValues[T]) {
  state[identifier] = newValue;
}

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Creating a React component with multiple prop types using Typescript

In this particular component, the requirement is to input a config object that can be of two types - either an object containing a "name" property (which should be a string), or a boolean value indicating that the config object has not been set yet. type C ...

Using Typescript: Compiling specific files within a directory

According to the documentation for typescript, we have the option in tsconfig.json to manage input files using either the files property where all files are listed, or with the exclude property. I have organized all my source files within a directory named ...

Steer clear of using inline styling when designing with Mui V5

I firmly believe that separating styling from code enhances the clarity and cleanliness of the code. Personally, I have always viewed using inline styling (style={{}}) as a bad practice. In Mui V4, it was simple - I would create a styles file and import i ...

What is the best way to disable a collapsed section in VS Code using comments?

I'm wondering how to properly comment out a "folded" section of code using VS Code. For instance, I want to comment out the collapsible region: if (a == b) { dance(); } I am familiar with the keyboard shortcut for folding regions: Ctrl + Shift + ...

Puppeteer: What is the best way to interact with a button that has a specific label?

When trying to click on a button with a specific label, I use the following code: const button = await this.page.$$eval('button', (elms: Element[], label: string) => { const el: Element = elms.find((el: Element) => el.textContent === l ...

Error in pagination when using MAX() function in PostgreSQL query

Here is the query I am using to retrieve the latest message from each room: SELECT MAX ( "Messages"."id" ) AS messageId, "Rooms"."id" FROM "RoomUsers" INNER JOIN "Rooms" ON " ...

How can the adapter pattern be implemented in Angular when dealing with an HTTP response containing an array of objects?

Using the adapter pattern in Angular, I have successfully adapted Http response to an 'Invoice' object. However, I am facing a challenge when one of the properties inside the 'Item' is an array. In this scenario, the 'items' ...

Building a PathString Tree

I encountered a similar issue like the one discussed in this post (Get a tree like structure out of path string). I attempted to implement the suggested solution but I am facing difficulties getting it to work within an Angular context. The concept involv ...

Combine two elements in an array

I am faced with a challenge in binding values from an Array. My goal is to display two values in a row, then the next two values in the following row, and so on. Unfortunately, I have been unable to achieve this using *ngFor. Any assistance would be greatl ...

Issue with Angular2/4 Module: Unable to locate 'three' in the application directory

As a newcomer to Angular and TypeScript, I am encountering difficulties when trying to import the @types/three npm package. I have created a new Angular project and attempted to use the three package, but I keep receiving the following error: Module not f ...

What is the best way to implement record updates in a nodejs CRUD application using prisma, express, and typescript?

Seeking to establish a basic API in node js using express and prisma. The schema includes the following model for clients: model Clients { id String @id @default(uuid()) email String @unique name String address String t ...

Zod Entry using standard encryption key

I'm attempting to define an object type in zod that looks like this: { default: string, [string]: string, } I've experimented with combining z.object and z.record using z.union, but the validation results are not as expected. const Local ...

Creating custom designs for Material UI components

Although not a major issue, there is something that bothers me. I am currently using react, typescript, and css modules along with . The problem arises when styling material ui components as I find myself needing to use !important quite frequently. Is th ...

Basic Karma setup with Typescript - Error: x is undefined

I am trying to configure a basic test runner using Karma in order to test a TypeScript class. However, when I attempt to run the tests with karma start, I encounter an error stating that ReferenceError: Calculator is not defined. It seems like either the ...

Most effective method for initiating model class attributes

Is there a more efficient way to initialize model classes without explicitly defining each member as undefined? The original concept was to be able to simply use super(data); in extended classes. class Model { construct(data: any) { Object.ke ...

What is the most efficient way to simultaneously check multiple variables for undefined values?

Before executing my code, I need to ensure that none of the variables in a given list are undefined. In the code snippet below, there are 4 variables with uncertain values. While I can manually check variables a and b to satisfy TypeScript's requirem ...

Script - Retrieve the content of the code element

I am currently developing an extension for VS Code that will enhance Skript syntax support. One challenge I am facing is the inability to select the body of the code block. Skript syntax includes various blocks such as commands, functions, and events, eac ...

Encountering difficulties with a custom Firestore service when attempting to extend it after updating to Angular 9

My custom class that wraps Angular Firestore is designed to be extended and used throughout my application. However, after updating to Angular 9, this setup no longer functions properly. For the complete code snippet, visit . The abstract class wrapper: ...

Converting an Array of Objects into a single Object in React: A Tutorial

AccessData fetching information from the database using graphql { id: '', name: '', regions: [ { id: '', name: '', districts: [ { id: '', ...

Troubleshooting TS Errors in Vue 3 and Vite with Typescript Integration

Currently experimenting with Vue 3, Vite, and TypeScript to build a Vue project. The configuration process has proven to be quite challenging. Despite consulting various documentation sources, I have not been successful in achieving my desired outcome. My ...