javascript - How to listen state changes in react.js?

Question

What is the angular's $watch function equivalent in React.js?

I want to listen state changes and call a function like getSearchResults().

componentDidMount: function() {
    this.getSearchResults();
}

Answer 1

The following lifecycle methods will be called when state changes. You can use the provided arguments and the current state to determine if something meaningful changed.

componentWillUpdate(object nextProps, object nextState)
componentDidUpdate(object prevProps, object prevState)