1handleChange: function (e) {
2    // 1. Make a shallow copy of the items
3    let items = [...this.state.items];
4    // 2. Make a shallow copy of the item you want to mutate
5    let item = {...items[1]};
6    // 3. Replace the property you're intested in
7    item.name = 'newName';
8    // 4. Put it back into our array. N.B. we *are* mutating the array here, but that's why we made a copy first
9    items[1] = item;
10    // 5. Set the state to our new copy
11    this.setState({items});
12},
13

1You have to use setState() for updating state in React
2{
3  hasBeenClicked: false,
4  currentTheme: 'blue',
5}
6
7setState({
8	hasBeenClicked: true
9});
10