Optics By Example

The lenses book for Haskell and other functional programming languages by @chrislpenner

[Optics By Example @opticsbyexample]

🔍Optics By Example has LAUNCHED! 🥳🎉

Go grab your copy! https://t.co/h9Wx8sspQm

Learn about the magic of Lenses, Traversals and Folds ✨

Thanks to everyone in the community who's helped make this a reality 😀

RTs appreciated ✅

[Jimmy Koppel @jimmykoppel]

With books like @opticsbyexample coming up, lots of people want to rework old code to use lenses.

Watching a headset designer writing a project proposal last night as she accidentally coined the term for this: refractoring.

[piq and 69 others @piq9117]

I’ve been able to get by with lenses and prisms but @chiroptical showed some traversals in his stream and they look really powerful. I’m excited to get to that chapter in the @opticsbyexample book.

[Chris Penner @chrislpenner]

Barry is working through examples from my book @opticsbyexample live on stream! It's fun to play along and see the thought process, come check it out!

[Chris Penner @chrislpenner]

SALE! Optics By Example is 25% off for the next two weeks!

The book is more polished than ever, so if you find yourself stuck at home for long periods of time, now's a great time to dive in.
Includes a link to buy a hardcover copy effectively at-cost 🙂
https://t.co/lXFAMh1EYl

[Shayne Fletcher 🥝 @shayne_fletcher]

Mine has arrived @opticsbyexample . Beautiful 😎

[Chris Penner @chrislpenner]

I believe that limited finances shouldn't ever be a barrier to anyone's education, so if for any reason you're unable to afford @opticsbyexample but still want to check it out, please DM me 😄
For those who can afford it, I really appreciate your support!
https://t.co/mZIagtDGnr

[Chris Penner @chrislpenner]

Attention @opticsbyexample readers! Physical copies are available for those who own the digital copy! You can find the discount link in the book's release notes or the "Extras" of the book on your leanpub account.

I'll have a purchase link available for the general public soon!

[Chris Penner @chrislpenner]

Just ordered a physical proof copy of @opticsbyexample , so hopefully you'll be able to order a meatspace version to hold in your hands sometime within the next month or so! Reminder that anyone who owns the digital copy gets a discount on the physical copy, so no reason to wait!

[sanjiv sahayam @ssanj]

> Does “Record Update Syntax” spark joy? If not, thank it for its service and throw it away. - Marie Kondo via @opticsbyexample #Haskell

[Chris Penner @chrislpenner]

Just launched 'lens-csv'; an optics library for manipulating and querying CSVs! It's a pretty natural operation and basically gives you a simple query and mutation language; effectively SQL for CSVs but as optics!
https://t.co/0CW7UfSOKj

[Bangalore Haskell Users Group @blrfunprog]

First #Haskell meetup for the year on Lenses. Thanks a lot to @nilenso for the venue. We looked at a bit at lens construction using lets-lens repo from data61 and usage examples of lenses from @opticsbyexample book.

[Optics By Example @opticsbyexample]

@shayne_fletcher Yup! It's in the works but is likely still a month or two out; I'll be offering discounts for owners of the digital copy, so feel free to start with that if you like 👍

[Sjur @SjurMillidahl]

I have been reading @opticsbyexample and it has been a great joy! It taught me a lot. Now what.. papers? 🤔

[Shayne Fletcher 🥝 @shayne_fletcher]

@opticsbyexample i must say, i'm enjoying reading it... kudos!

[Optics By Example @opticsbyexample]

Optics By Example is on Sale!

For a limited time you can grab the comprehensive guide to lenses, prisms, traversals and more for only $30!
That's 50% off the suggested price 😵

If you were waiting for a sale, this is it! 😄

https://t.co/kdGCxVLJOQ

[Optics By Example @opticsbyexample]

Exploring Algebraic lenses: A brand new type of optic!
https://t.co/tDr7AtL4fu

[Optics By Example @opticsbyexample]

In case you missed it the first time around:
🔎Optics By Example is hot off the (digital) presses!

Go grab it on leanpub, complete with exercises, in pdf, epub, or mobi 😄

Reviews are positive so far and I'd love to hear what you think

https://t.co/a4CSUJHJ0y

[Chris Penner @chrislpenner]

To promote the release of @opticsbyexample, all day today I'll answer questions about the process of writing a technical book! Ask me about my process, the content, the tools I use, about @leanpub, etc!

https://t.co/mZIagtVheZ

[Optics By Example @opticsbyexample]

@jasdev @bow_swift Very interesting! I hope it works out, let me know how the knowledge carries over 😄