Updating object in array with Vuex [duplicate]

Answer 1

[mutationType.UPDATE_CATEGORY] (state, id, category) {
  state.categories = [
     ...state.categories.filter(element => element.id !== id),
     category
  ]
}

This works by replacing the 'categories' array with the original array without the matching element, and then concatenating the updated element to the end of the array.

One caveat to this method is that it destroys the order of the array, although in a lot of cases that won't be a problem. Just something to keep in mind.