react case switch not working

1renderSwitch(param) {
2  switch(param) {
3    case 'foo':
4      return 'bar';
5    default:
6      return 'foo';
7  }
8}
9
10render() {
11  return (
12    <div>
13      <div>
14          // removed for brevity
15      </div>
16      {this.renderSwitch(param)}
17      <div>
18          // removed for brevity
19      </div>
20    </div>
21  );
22}