In addition to Sophie's answer, I also have found a use in sending in child component types, doing something like this:
var ListView = React.createClass({
render: function() {
var items = this.props.data.map(function(item) {
return this.props.delegate({data:item});
}.bind(this));
return <ul>{items}</ul>;
}
});
var ItemDelegate = React.createClass({
render: function() {
return <li>{this.props.data}</li>
}
});
var Wrapper = React.createClass({
render: function() {
return <ListView delegate={ItemDelegate} data={someListOfData} />
}
});