Editing multiple object value in an object array with useState

Question

I have an object array similar to below

[array1, setArray1] = useState(
        [
        {
          name: "somename",
          count: 0,
          division: "somedivision",
          cost: 1000,
        },
        {
          name: "secondname",
          count: 0,
          division: "somedivision",
          cost: 2000,
        },
      ]
)

How can i individually update the cost value of each object in my list?

I was thinking of something like setArray1((previous) => ({...previous, cost: newcost}))

But how can i do this for multiple objects in an object array?

Answer 1

 const App = () =>{ const [array, setArray] = React.useState([ { name: "somename", count: 0, division: "somedivision", cost: 1000, }, { name: "secondname", count: 0, division: "somedivision", cost: 2000, }, ]) const updateCosts = () => { let newCosts = [1002, 2006] setArray(previous => previous.map((elem, index)=> { return({...elem, cost: newCosts[index]}) }) ) } return( <div> <button onClick={()=>updateCosts()}>Update costs</button> { array.map(elem => <p key={elem.name}>{`Product ${elem.name} Cost ${elem.cost}`}</p>) } </div> ) } ReactDOM.render( <App/>, document.getElementById("root") );

 <div id="root"></div> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>