Talking head
Ruby Conference 2014

This presentation, by Dinshaw Gobhai, is licensed under a Creative Commons Attribution ShareAlike 3.0
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Sequential workflows are easy to write (top down), but hard to write well. State machine workflows start to feel hacky, when complex; presenter patterns can be very heavy. Promises are a beautiful way to define and execute progressive routines while allowing access to independent steps for things like logging, exception handling, and picking up where you left off.

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