changing state value react
const [a, b] = React.useState(['hi','world']);
const dup = [...a]; //won't work without spread operator
b(dup);changing state value react
const [a, b] = React.useState(['hi','world']);
const dup = [...a]; //won't work without spread operator
b(dup);how to update state.item[1] in state using setState? React
handleChange: function (e) {
// 1. Make a shallow copy of the items
let items = [...this.state.items];
// 2. Make a shallow copy of the item you want to mutate
let item = {...items[1]};
// 3. Replace the property you're intested in
item.name = 'newName';
// 4. Put it back into our array. N.B. we *are* mutating the array here, but that's why we made a copy first
items[1] = item;
// 5. Set the state to our new copy
this.setState({items});
},Copyright © 2021 Codeinu
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