React & update state with props & Object.assign

React & update state with props & Object.assign

Object.assign({}, oldObj, newObj)

https://reactjs.org/docs/react-component.html#unsafe_componentwillreceiveprops

Object.assign(
  previousState,
  {quantity: state.quantity + 1},
  {quantity: state.quantity + 1},
  ...
)

https://stackoverflow.com/questions/32414308/updating-state-on-props-change-in-react-form

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