How to add data to an object (react.js)?

Question

JavaScript

There is an object

getInitialState: function() {
  return {
    dob: {
      'month' : 'January',
      'day' : '01',
      'year' : '2015'

  };
},

How to change the data in it, for example, for year?
It doesn't work this.setState({dob.year: '1980'})

Answer 1

for example

this.setState({
    dob: {
         ...this.state.dob,
         year: '1980'
    }
})

Although this can be optimized for example using ramdajs.com/0.18.0/docs/#lens

Answer 2

this.setState({ dob: { year: '1980' }});

Answer 3

It's also possible like this:

this.state.dob.year = 1980;
this.setState(this.state);
// или так 
this.setState(function(state) {
    state.dob.year = 1980;
    return state;
});