recursive video

// https://www.facebook.com/towernter/videos/3166329563380276/

class Recording {
    /** Creates an instance with the optional reference to previous recordings. */
    constructor(private optional field previous : Recording) {}
    /** sets up the camera and films the person shoring the previous video.*/
    execute():void { ... }
    /** Renders and returns the video of this recording. */
    video():Video { ... }
}
function makeRecursiveVideo(optional argument previous : recording) : recording {
    let recording = new Recording(previous);
    recording.execute();
    if(recording.video().length() < 30 seconds) {
        recording = makeRecursiveVideo(recording);
    }
    return recording;
}
let recording = makeRecursiveVideo(null);
display(recording.video())