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Reducer Function in React Redux

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M Akbar Maulana answered on October 31, 2020 Popularity 10/10 Helpfulness 3/10

answer Reducer Function in React Redux

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related redux reducer

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Reducer Function in React Redux

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// (state, action) => newState
function todosReducer(todos = [], action = {}) {
  switch (action.type) {
    case 'ADD_TODO':
      return [...todos, action.payload];
    case 'DELETE_TODO':
      return todos.filter((todo) => todo.id !== action.payload.id);
    case 'DELETE_ALL_TODO':
      return [];
    case 'TOGGLE_TODO':
      return todos.map((todo) => {
        if (todo.id === action.payload.id) {
          return { ...todo, complete: !todo.complete };
        }
        return todo;
      });
    default:
      return todos;
  }
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: codesandbox.io

Tags: function javascript react-redux

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Contributed on Dec 25 2022

M Akbar Maulana

0 Answers Avg Quality 2/10

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redux reducer

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const Reducer = (state=[],action) =>{
	switch(action.type){
      case'add':
        return [...state,action.payload]
      default:
        return state ;
    }
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 31 2020

Joyous Jackal

0 Answers Avg Quality 2/10

Update State in react redux reducer

Comment

case foodConstants.FOOD_SUCCESS_POST: {

  let updatedItems = { ...state.items };
  const itemIndex = updatedItems.findIndex((food1) => food1.id === action.id);

  if(itemIndex > -1){
    updatedItems[itemIndex] = {
        ...updatedItems[itemIndex],
        ...action,
    }
  }

 return { ...state, items: updatedItems };
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jun 26 2021

Blue Bee

0 Answers Avg Quality 2/10

redux reducer

Comment

const reducer = (state = initialState, action) => {
  switch (action.type) {
    case "BUY_CAKE":
      return {
        numOfCakes: state.numOfCakes - 1,
      };
    default:
      return state;
  }
};

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Feb 22 2022

Omatsola Eyeoyibo

0 Answers Avg Quality 2/10

Update State in react redux reducer

Comment

case foodConstants.FOOD_SUCCESS_POST: {

  const updatedItems = state.items.map((food1) => {
    if (food1.id === action.id) {
      return { ...action };
    }

    return food1;
  });
 return { ...state, items: updatedItems };
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jun 26 2021

Blue Bee

0 Answers Avg Quality 2/10

How reducer works in redux

Comment

const initialState = { value: 0 }

function counterReducer(state = initialState, action) {
  // Check to see if the reducer cares about this action
  if (action.type === 'counter/increment') {
    // If so, make a copy of `state`
    return {
      ...state,
      // and update the copy with the new value
      value: state.value + 1
    }
  }
  // otherwise return the existing state unchanged
  return state
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Apr 03 2022

Moscode

0 Answers Avg Quality 2/10

reducer function redux

Comment

{/**The logic inside reducer functions typically follows the same series of steps:

Check to see if the reducer cares about this action
If so, make a copy of the state, update the copy with new values, and return it
Otherwise, return the existing state unchanged
Here's a small example of a reducer, showing the steps that each reducer should follow:
*/}

const initialState = { value: 0 }

function counterReducer(state = initialState, action) {
  // Check to see if the reducer cares about this action
  if (action.type === 'counter/incremented') {
    // If so, make a copy of `state`
    return {
      ...state,
      // and update the copy with the new value
      value: state.value + 1
    }
  }
  // otherwise return the existing state unchanged
  return state
}

//Reducers can use any kind of logic inside to decide what the new state should be: if/else, switch, loops, and so on.

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: redux.js.org

Tags: function functio

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Contributed on Oct 05 2022

Ana Matei

0 Answers Avg Quality 2/10

redux reducer example

Comment

import * as ActionTypes from './ActionTypes';

export const comments = (state = { errMess: null, comments: []}, action) => {
    switch (action.type) {
        case ActionTypes.ADD_COMMENTS:
            return {...state, errMess: null, comments: action.payload};

        case ActionTypes.COMMENTS_FAILED:
            return {...state, errMess: action.payload};

        default:
            return state;
    }
};

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: learn.nucamp.co

Tags: javascript j

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Contributed on Jan 27 2022

Helpless Hummingbird

0 Answers Avg Quality 2/10

Reducer Function in React Redux

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Reducer Function in React Redux

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redux reducer

Update State in react redux reducer

redux reducer

Update State in react redux reducer

How reducer works in redux

reducer function redux

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