UI programming doesn't need to be callback heavy. Rob Pike designed one of the spiritual ancestors of Go, Squeak ( http://doc.cat-v.org/bell_labs/squeak/ http:

UI programming doesn't need to be callback heavy. Rob Pike designed one of the spiritual ancestors of Go, Squeak ( http://doc.cat-v.org/bell_labs/squeak/ http://doc.cat-v.org/bell_labs/squeak/ ) using the CSP model of concurrency specially to build (G)UIs.