Question 211016 in Reactjs Question posted in
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Reactjs – Increment a value of state object

I want to update the days value inside the state object each time and increate it’s value by one

const [leap, setLeap] = useState({state: false, days:0})

So i tried doing it like that but that did not help

setLeap((prevState)=> ({...prevState, days: days++ }))}
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2

Answers


  1. 0

    Destructure days out of the previous state, and assign days + 1 to the new days state:

    setLeap(({ ...prevState, days }) => ({ ...prevState, days: days + 1 }))}
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  2. 0

    You need to use the days key from the prevState for incrementing. Do as follows:

    setLeap((prevState)=> ({...prevState, days: prevState.days + 1 }))}
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