The second coming of Yehonathan on defn, who brought us Klipse,  in which he talks about what/why/how of data oriented programming and why Clojure is the best language for data oriented programming with a dash of christian theology.

#70 - Yehonathan Sharvit

The audiobook of The Colour of Magic is read by Colin Morgan (Merlin; Testament of Youth; Belfast). BAFTA and Golden Globe award-winning actor Bill Nighy (Love Actually; Pirates of the Caribbean; Harry Potter and the Deathly Hallows) reads the footnotes, and Peter Serafinowicz (Star Wars: Episode I - The Phantom Menace; Shaun of the Dead) stars as the voice of Death. Featuring a new theme tune composed by James Hannigan.

'It was octarine, the colour of magic. It was alive and glowing and vibrant and it was the undisputed pigment of the imagination....'

Somewhere between thought and reality exists the Discworld, a magical world not totally unlike our own. Except for the fact that it travels through space on the shoulders of four giant elephants who in turn stand on the shell of an astronomically huge star turtle, of course.

Rincewind is the world's worst wizard who has just been handed a very important job: to look after the world's first tourist, upon whose survival rests the peace and prosperity of the land. Unfortunately, their journey across the Disc includes facing robbers, monsters, mercenaries, and Death himself.

And the whole thing's just a game of the gods that might send them over the edge....

You can listen to the Discworld novels in any order, but The Colour of Magic is the first book in the Wizards series. The Colour of Magic is the first book in the Discworld series and was published in 1983. Some elements of the Discworld universe may reflect this.

The Colour of Magic by Terry Pratchett, read by Colin Morgan, Bill Nighy and Peter Serafinowicz

Melon Hamburger

Rip Delay

Launch episode explaining our motivations for being Clojure and ClojureScipt enthusiasts.

#1 - Hello World

Defn Episode #02 - The Reader

[ a little news: spec ]

The wonders of the Reader
- Compare to the C pre-processor 
- How it underpins the language
- Reader forms
- EDN / Transit
- Tagged literals
- Reader Conditionals (1.7+)
- clojure.tools.reader
- Finally, why no user defined reader macros (as in Common Lisp and Scheme)?

References
The Data-Reader's Guide to the Galaxy (Clojure West, 2013) by Steve Miner
Spyscope by David Greenberg

More information and links at the DEFN website 
https://defn.audio/2016/05/30/episode-02-the-reader/

Our thanks to Ptzery for the intro and outro music (Melon Hamburger)
https://soundcloud.com/ptzery/

#2 - The Reader

This episode we welcome Mr Mike Fikes to help us on a tour of the Clojure REPLs

#3 - A tour of the REPLs with Mike Fikes

Overview of Persistent Collections

- Intro | Follow-up | News
  - Discussion on community relations

- Immutable Persistent Collections

List vs Vector
- Linked list vs tree implementation

Map vs Set
- Key can be anything
- KV | Unique KV
- Relational operations on set are outside of core

Seq library
- ISeq (first, rest, cons)
- Interop with Java utterable
- Functions are written to work against the Seq interface
- Seq in, Seq out

Immutability and Persistence
- What is it?
- Why is it important?
- Implementation

Lazy collections
- What does it mean to be lazy?
- What does it mean to hold on the head?

Eager operations
- Sometimes you need side effects so you cannot be lazy
- Doall, doseq

Persistent vs. Transient
- Performance

SPECTER - Nathan Marz
- Ensure output format of collection operations is controlled
- Editing operations

Community contributed collections - shout out to
- Chris Houser - Data.zip
- Michał Marczyk - Ctries and AVL
- Mark Engelberg - Priority maps
- Lean Hash Maps Peter Schuck

See the podcast web site http://defn.audio for links


#4 - Immutable Persistent Collections

*Follow up*

We retain our status as the top vegetarian Clojure podcast. Phew.

Maria Geller’s video - in which she did a great job of explaining how the CLJS compiler works and provides some interface to the contribution process:
https://www.youtube.com/watch?v=Elg17s_nwDg

*News*

Euro Clojure - Bratislava tickets are on sale. Defn will be there

*Main discussion - ClojureScript UI - Hoplon Special*

http://hoplon.io

Welcome to Micha Niskin - co-author of the awesome Hoplon library collection
 
Potted history of Micha and the main goals of Hoplon
Hoplon - LISP based DOM manipulation

Javelin - Spreadsheet data flow model

Castra - CQRS, RPC

Comparison to React / Rum / Reagent

*Credits*

Special Guest: Micha Niskin. Thanks Micha and please look after those nukes.

Music: Thanks to the very talented ptzery for the permitting us to use his music on the opening and closing of the podcast. This track is Melon Hamburger. You can give his work some ❤️ and hear more on his SoundCloud.


#5 - Hoplon Special with Micha Niskin

A discussion about spec

For detailed information and links, see the show notes at 

https://defn.audio/2016/09/21/episode-10-spec-ial/

#10 - Spec.ial

On today’s podcast, Justin Cormack discusses how the modern operating system is being decomposed with toolkits and libraries such as LinuxKit, eBPF, XDP, and what the kernel space service mesh Cilium is doing. Wes Reisz and Justin Cormack also discuss how Cilium differs from service meshes like an Istio, Linkerd2 (previously Conduit), or Envoy. Justin is a systems engineer at Docker. He previously was working with unikernels at Unikernel Systems in Cambridge before being acquired by Docker. (edited)

*Key Takeaways:*
* LinuxKit is an appliance way of thinking about your operating system and is gaining adoption. There are contributions now from Oracle, Cloudflare, Intel, etc. Docker has seen interesting use cases such as customers running LinuxKit on large cloud providers directly on bare metal (more on this coming soon).
* The operating system of today is really unchanged since the Sun workstation of the 90’s. Yet everything else about software has really changed such as automation, build pipelines, and delivery.
* XDP (eXpress Data Path) is a packet processing layer for Linux that lets you run fast in kernel compiled safe program in kernel called eBPF. It’s used for things like packet filtering and encapsulation/decapsulation.
* Cilium is an in-kernel, high performance service mesh that leverages eBPF. Cilium is very good at layer 4 processing, but doesn’t really do the layer 7 things that some of the other services meshes can offer (such as proxying http/1 to http/2)

Justin Cormack on Decomposing the Modern Operating System

The world's greatest vegetarian Clojure podcast. Support us on https://patreon.com/defn

Hosted by Vijay Kiran and Ray McDermott

#70 - Yehonathan Sharvit

defn

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