Javascript switch with conditionals

I needed a way to keep my code clean but have lots of else-if type statements. I eventually got this working with a switch.

switch (true) {
    //folders
    case obj.mimeType === 'application/vnd.google-apps.folder':
        doThis();
        break;

    //video files
    case obj.mimeType.indexOf('video') === 0:
        orDoThis();
        break;
}