Pre-conj Prep: Rich Hickey
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Transducers are a way to define the standard map, filter, and mapcat functions that does not bake in the idea of creating a list as output. Instead, it takes that as a parameter. It's hard to explain, but Rich Hickey does a great job making it clear.
The talk has no abstract at the time of this writing, so I can't say what he will add to the Strange Loop talk he gave. But I would guess that it will be more deeply aimed at Clojure programmers.
Why it matters
Transducers are very new. They haven't even been released yet. However, they've already made a splash, with static typists trying to come up with their type signature, and implementations in other libraries.