continuations.js

function find_paths(w, h, downs, rights, path, paths, continuation) {
  if ((downs == h) && (rights == w)) {
    draw_path(path)
    setTimeout(function() {
      continuation(paths + 1)
    }, 1000)
  } 
  else if (downs < h) {
    find_paths(w, h, downs + 1, rights, path.concat('d'), paths, continuation)
  }
  else if (rights < w) {
    find_paths(w, h, downs, rights + 1, path.concat('r'), paths, continuation)
  }
  else {
    continuation(paths)
  }
}

returns.js

 function find_paths(w, h, downs, rights, path, paths) {
        if ((downs == h) && (rights == w)) {
            draw_path(path);
            // I want the equivalent of sleep(1) here
            return paths + 1;
        }
        if (downs < h)
            paths = find_paths(w, h, downs+1, rights, path.concat('d'), paths);
        if (rights < w)
            paths = find_paths(w, h, downs, rights+1, path.concat('r'), paths);
        return paths
    }