JavaScript Is adding a value inside an array.map considered mutating? add value inside array javascript,add value inside array,add

I know redux is strict with state management, but is adding a value from an array of objects considered a no no in redux? Example:

// Consider this array of objects on action
action.arr = [ { test: 'me', hail: 'hydra'}, { test: 'you', ring: 'of fire'} ]
// reducer.js
fn = (state = defaultState, action) => {
  ...
  case action.LORD_COMMANDER:
    return action.arr.map(v => {
      v.john = 'snow'
      return v
    })
  ...
}
Answer:1

I think better use Object.assign. Let's consider two examples

const arr  = [ { test: 'me', hail: 'hydra'}, { test: 'you', ring: 'of fire'} ];
const arr1 = arr.map(v => {
  v.john = 'snow'
  return v;
});

console.log(arr, arr1);
Answer:2

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