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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