componentdidmounst-reduction.js

var Reduction = React.createClass(
{

    render: function() {
        var self = this;
        return <div><Child isParentMounted = { function() { return self.isMounted(); } } /></div>;
    },
    componentDidMount: function() { console.log("actually mounted."); }
});
var Child = React.createClass(
{
    render: function() { return <div>{ this.props.isParentMounted() ? "yes" : "no" }</div>; },
    componentDidMount: function()
    {
        console.log("this should surely be no: " + (this.props.isParentMounted() ? "yes" : "no"));
    }
});

var test = React.renderComponent(<Reduction />, document.getElementById("container"));