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From FPX 2015, video at: https://skillsmatter.com/skillscasts/6417-functional-programming-in-an-imperative-world#video
Once upon a time there was a small company with a large codebase. That codebase had been written in the well understood languages of "VeeBeeDotNet" and "CeeSharp". After a while, more people starting working for the small company, and while they all knew some CeeSharp and VeeBeeDotNet, some of them also spoke strange foreign languages like "Erlang" and "EffSharp". They liked these languages, and were unwilling to give up what they saw as their powerful magical properties of pureness. So they hatched a plan..
This talk is a completely anecdotal review of how a group of developers (not managers) introduced functional techniques and languages into a company with an existing imperative code base - and existing imperative coders! Learn how we convinced management it wasn't insane. How we picked low risk, high impact tasks to illustrate language advantages. And how we spread the joy to others who hadn't used functional programming languages before.