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use Reducer in React

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Er. Anil Kumar Thakur answered on September 6, 2021 Popularity 10/10 Helpfulness 2/10

answer use Reducer in React

related .reduce react

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use Reducer in React

Comment

 
 const actionType={
 INCREMENT:'INCREMENT',
 DECREMENT:'DECREMENT'
 };//define const that can be used in whole particular file without mistake



function reducer(state, action) {
  switch (action.type) {
    case actionType.INCREMENT: // defined at top 
      return {count: state.count + 1};
    case actionType.DECREMENT: // defined at top
      return {count: state.count - 1};
    default:
      return state;
  }
}



dispatch({type: actionType.INCREMENT});
<button onClick={() => dispatch({type: actionType.INCREMENT})}>Increment</button> // defined at top 
<button onClick={() => dispatch({type: actionType.DECREMENT})}>Increment</button> // defined at top

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript use-reducer

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Contributed on Feb 16 2023

Er. Anil Kumar Thakur

0 Answers Avg Quality 2/10

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.reduce react

Comment

const input = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const sumOfConsecutives = (value1, value2) => value1 + value2;

const sumOfNums = input.reduce(sumOfConsecutives);
/* result:
{
  input: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
  sumOfNums: 55,
}
*/

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: retool.com

Tags: javascript j

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Contributed on Dec 01 2022

Innocent Iguana

0 Answers Avg Quality 2/10

reducer react

Comment

const getTotalItems = (items: CartItemType[]) =>
    items.reduce((ack: number, item) => ack + item.amount, 0);

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 06 2021

brown eye gands

0 Answers Avg Quality 2/10

use Reducer in React

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