JavaScript Adding one element in array in React-Redux add element array javascript,add element array php,add element

I'm not sure if I understand you correctly but from my understanding the solution to your problem would look something like this:

case CHANGE_EVENT_USERS:
  return { ...state, users: [ ...state.users, action.payload ] };
Answer:1

I like better the syntax of concat. In your reducer do:

case CHANGE_EVENT_USERS:
  return users.concat(action.payload);
Answer:2

Use concat()

const initialArray = [1, 2, 3];  
const elemenToAdd = 4; 
const newArray= initialArray.concat([elementToAdd]);  

[1, 2, 3, 4]

Notice I'm using const here to emphasize that the initial array was not mutated.

The great thing about the method above, it's that it can be used to chain operations together.
result = initialArray.concat(..).filter(..).concat(..);
(where .. represents skipped code details)

You can also use concat by passing in arrays as parameters:
newArray = concat(initialArray, [elementToadd])

Or use es7 spread operator syntax for array concatenating:
newArray = [...initialArray, elementToAdd, ...[5], [6] ];

[1, 2, 3, 4, 5, [6] ]

Use ... to send individual elements of the supplied array to be elements in the new array; without the dots, the supplied array is itself the element.

So in the your case, the line in question could be written as:

Answer:3

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