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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
For an alternative and dedicated variation, take a look at Tasker - Task synchronizer - kind of a 'purposed' Promise.
*EDIT* (at the time of version 1v94 (2017-08-29))
Version 1v86 (2016-07-05) introduced Promise and Promise has matured thru version 1v91 (2017-01-12). Promise makes life of synchronizing/sequencing of asynchronous tasks/callback of callbacks of callbacks of... much much easier... Promise is practically the only way out of callback-hell.