Y Not – Adventures in Functional Programming (2012) 254 points by fredwu 1127 days ago | hide | past | web | 14 comments | favorite

 Jeff Casimir summed up the situation well:>If you want to honor @jimweirich, treat everyone like they're your best friend, smart, and fascinating. That's how he lived.
 I saw the version of this talk that he gave at Strange Loop in 2012 using Clojure instead of Ruby:https://thestrangeloop.com/sessions/y-not-adventures-in-func...It was hands down the best talk at the conference that year. RIP.Edit: 2013 => 2012
 Was it the one from 2012? The video is available on infoq.
 Sorry, yes, it was 2012.
 I was there as well, definitely one the best talks there, which is saying a lot as Strange Loop is amazing. I didn't realize he died until I saw this thread/comment :(. RIP.
 I was very curious to see a post on the Ynot project http://ynot.cs.harvard.edu/ on HN but this make more sense.
 I thought I'd never understand the Y-Combinator and unbelievably after that talk I nearly kind of do. What a great speaker, you can see that the guy had such a warm heart and spirit. My sympathies go out to anyone who knew him personally.
 I've taken to defining "@" as the Y combinator, so it looks kind of like a "goto" label for looping, e.g.:`````` (@\fact\n \n==n <= n 0 1 (* n (fact (- n 1)))) `````` (The \n==n forces an eager evaluation, to avoid building a tower of deferred operations with large n.)The symbol "fact" is arbitrary, e.g. you could say this instead:`````` (@\loop\n \n==n <= n 0 1 (* n (loop (- n 1)))) `````` To define a name "fact" for that function, it's:`` \fact = (@\loop\n \n==n <= n 0 1 (* n (loop (- n 1))))``
 It's a shame about Jim. I never knew him but he did a lot for the community. RIP, he'll be missed.
 This is hands down my favorite talk that Jim ever gave. A great example of live coding.
 Very impressive. He seemed to know his numerous-stage demo by heart and made effectively no mistakes.
 Confreaks.com seems to be having some troubles, I'm guessing this is the same talk:Ruby Conf 12 - Y Not- Adventures in Functional Programming by Jim Weirich (uploaded by Confreaks):
 I've just learned about the Y-Combinator in a lecture about functional programming a few weeks ago. Very excited for the Video as soon, as the website is up again.
 Was introduced only recently to Jim Weirich. Fabulous computer engineer and talker. RIP.

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