ReactJS by Example - Building Modern Web Applications with React

Specifying default props

"Shawn, React also allows us to define some default values for props. This is useful when parent component is passing props based on some condition or not passing some props at all due to some change," Mike said.

var App = React.createClass({

 getDefaultProps: function() {
    return {
      headings: ['When happened ', 'Who did it', 'What they change']
    };
  },
  
  render: function(){
            …
  }
});

var data = [{ "when": "2 minutes ago",
              "who": "Jill Dupre",
              "description": "Created new account"
            },
            {
              "when": "1 hour ago",
              "who": "Lose White",
              "description": "Added first chapter"
            }];

React.render(<App changeSets={data}/>, document.body);

"Here, we updated the code to not send the headings from props. Instead, we used the getDefaultProps function ...