Questions tagged [reducers]

The term "reduce" pertains to the process of condensing an array of elements into a singular value. This concept is commonly utilized in programming languages such as [c++] and functions like [google-sheets-formula]. It is important to note that reduce should not be used independently but alongside other operations.

Excessive API requests can occur when Redux dispatches an action multiple times

Utilizing the Jikan API for anime, my objective is to showcase promo thumbnails of new anime shows. This involves two separate API calls: one to retrieve the latest anime shows: export const get_new_anime = () => `${base_url}search/anime?q&order_b ...

javascriptreactjsreduxreducers

Refactor the fat arrow function in Typescript to maintain the bare function signature verification

When using AOT in Angular, it is necessary to rewrite all functions and reducers to not utilize arrow functions: An error occurred: Error encountered resolving symbol values statically. Function calls are not supported. Consider replacing the function o ...

angulartypescriptngrxreducers

Can a props be retrieved and passed as an argument to a function?

My goal is to retrieve a prop from MapsStateToProps using react-redux's connect and then pass it to a child component. This prop serves as an argument for a function, which in turn returns something that becomes the state of the child component. Alth ...

javascriptreactjsreduxaxiosreducers

State remains unchanged as reducer fails to update

I am attempting to create a new function in order to update a specific property within an object. Unfortunately, I am encountering difficulties when it comes to storing and updating the new state information. Reducer export default function replaceCardN ...

reactjsreact-nativereduxreact-reduxreducers

Breaking down the initial state within a redux reducer

Can you explain the distinction between returning state in the default case of a Redux reducer using return state and return { ...state } ? ...

javascriptreactjsreduxreact-reduxreducers

What is the best way to assign a value to an ngrx reducer/action in order to update the state?

As a newcomer to Angular ngrx, I am in the process of integrating it into my 'standard beginner-project' by replacing all @Input()s and @Output()s. While incrementing and decrementing the state is straightforward, I am faced with the challenge of ...

angularngrx-storereducers

Managing State Changes with Redux

Reducers in Redux are primarily designed to be pure functions that take the previous state and an action as arguments, and return a new state object without mutating the previous state. However, it is still possible for developers to directly mutate the st ...

javascriptreduxreducersmutation

Assigning value to a state within a map function of a reducer: A guide

Attempting to retrieve the type value of a clicked card and I am expecting to extract the type of that card. The state.memoryCards shows the following output in the console: 0: {name: "Aircraft", type: "200", maxSpeed: 880, imageName: "a1", …} 1: {name ...

reactjsreduxreducers

Retrieving information from the database and transferring it to the front end via the router

I have been working on a MERN Expo app login and sign-in page. However, I am facing an issue with fetching data from the backend after clicking the sign-in button. Even though I have implemented the find query in the Express router, I am unable to retrieve ...

reactjsmongodbexpressmernreducers