Yeah async is difficult to reason about. I found a solution with generators in my custom programming language to keep the flow sequential (especially for UI).

Yeah async is difficult to reason about. I found a solution with generators in my custom programming language to keep the flow sequential (especially for UI). An example of two ok/cancel buttons followed by some sleep (with generators too): http://dailyprog.org/~mabynogy/test/ http://dailyprog.org/~mabynogy/test/ source code (in my coffescript-like language): https://p.sicp.me/irDrC.js https://p.sicp.me/irDrC.js generated output: https://p.sicp.me/fu6CW.js https://p.sicp.me/fu6CW.js