It's as standard a solution as any, it just doesn't require changing the language. If you can Promise.all, you can Promise.coroutine. Putting async in front of

It's as standard a solution as any, it just doesn't require changing the language. If you can Promise.all, you can Promise.coroutine. Putting async in front of a function definition requires learning a new syntax, but wrapping a coroutine FN around it builds on knowledge of existing behaviour.