ReactJS - setState of Object key in Array

Question

So i\'ve been working on this for awhile and felt it would be best to refactor my code so that the state is set up as an array of objects. What i\'m trying to do is increme

Answer 1

Get current state, modify it and setState() it:

var stateCopy = Object.assign({}, this.state);
stateCopy.items[key].upVotes += 1;
this.setState(stateCopy);

Note: This will mutate the state. Here's how to do it without mutation:

var stateCopy = Object.assign({}, this.state);
stateCopy.items = stateCopy.items.slice();
stateCopy.items[key] = Object.assign({}, stateCopy.items[key]);
stateCopy.items[key].upVotes += 1;
this.setState(stateCopy);