1) Yes, you can restructure/destructure variables at each step, but you're just unifying the control flow and data flow by hand. Yet another flavor of human com

1) Yes, you can restructure/destructure variables at each step, but you're just unifying the control flow and data flow by hand. Yet another flavor of human compiler. 2) catch's entire purpose is to be a catch-all for unexpected errors. For expected errors, it's better to have explicit error values. Bluebird.js at least lets you differentiate .catch from .error, where .error handles the explicit error values generated from traditional Node.js callbacks.