javascript - what is the preferred way to mutate a React state?

Question

Let's say I have a list of plain objects in my this.state.list that I can then use to render a list of children. What then is the right way to insert object into this.state.list?

Below is the only way I think it will work because you can not mutate the this.state directly as mentioned in the doc.

this._list.push(newObject):
this.setState({list: this._list});

This seems ugly to me. Is there a better way?

Answer 1

concat returns a new array, so you can do

this.setState({list: this.state.list.concat([newObject])});

another alternative is React's immutability helper

  var newState = React.addons.update(this.state, {
      list : {
        $push : [newObject]
      }
  });

  this.setState(newState);