Berlin ; New York : Springer, [2005]

On today's JavaScript Jabber Show, Charles, Joe, Aimee, Cory, and AJ discuss Clean Code JavaScript with Ryan McDermott. Ryan is a UX Engineer at Google and has been a professional developer for 5 years. He's focused on frontend Angular and backend node.js. Stay tuned to learn more about his current project with JavaScript!

JSJ 275: Zones in Node with Austin McDaniel

The panel for this week on JavaScript Jabber is Cory House, Aimee Knight, and Charles Max Wood. They speak with special guest Austin McDaniel about Zones in Node. Tune in to learn more about this topic!

[00:01:11] Introduction to Austin

Austin has worked in JavaScript for the past ten years. He currently works in Angular development and is a panelist on Angular Air. He has spent most of his career doing work in front-end development but has recently begun working with back-end development. With his move to back-end work he has incorporated front-end ideas with Angular into a back-end concept.

[00:02:00] The Way it Works

NodeJS is an event loop. There is no way to scope the context of a call stack. So for example, Austin makes a Node request to a server and wants to track the life cycle of that Node request. Once deep in the scope, or deep in the code, it is not easy to get the unique id. Maybe he wants to get the user from Passport JS. Other languages – Python, Java – have a concept called thread local storage. They can associate context with the thread and throughout the life cycle of that request, he can retrieve that context.

There is a TC39 proposal for zones. A zone allows you to do what was just described. They can create new zones and associate data with them. Zones can also associate unique ids for requests and can associate the user so they can see who requested later in the stack. Zones also allow to scope and create a context. And then it allows scoping requests and capturing contacts all the way down.

[00:05:40] Zone Uses

One way Zone is being used is to capture stack traces, and associating unique ids with the requests. If there is an error, then Zone can capture a stack request and associate that back to the request that happened. Otherwise, the error would be vague.

Zones are a TC39 proposal. Because it is still a proposal people are unsure how they can use it. Zones are not a new concept. Austin first saw Zones being used back when Angular 2 was first conceived. If an event happened and they wanted to isolate a component and create a scope for it, they used Zones to do so. Not a huge fan of how it worked out (quirky). He used the same library that Angular uses in his backend. It is a specific implementation for Node. Monkey patches all of the functions and creates a scope and passes it down to your functions, which does a good job capturing the information.

[00:08:40] Is installing the library all you need to get this started?

Yes, go to npminstallzone.js and install the library. There is a middler function for kla. To fork the zone, typing zone.current. This takes the Zone you are in and creates a new isolated Zone for that fork. A name can then be created for the Zone so it can be associated back with a call stack and assigned properties. Later, any properties can be retrieved no matter what level you are at.

[00:09:50] So did you create the Zone library or did Google?

The Google team created the Zone library. It was introduced in 2014 with Angular 2. It is currently used in front-end development.

[00:10:12] Is the TC39 proposal based on the Zone library?

While Austin has a feeling that the TC39 proposal came out of the Zone library, he cannot say for sure.

[00:10:39] What stage is the proposal in right now?

Zone is in Stage Zero right now. Zone JS is the most popular version because of its forced adoption to Angular. He recommends people use the Angular version because it is the most tested as it has a high number of people using it for front-end development.

[00:11:50] Is there an easy way to copy the information from one thread to another?

Yes. The best way would probably be to manually copy the information. Forking it may also work.

[00:14:18] Is Stage Zero where someone is still looking to put it in or is it imminent?

Austin believes that since it is actually in a stage, it means it is going to happen eventually but could be wrong. He assumes that it is going to be similar to the version that is out now. Aimee read that Stage Zero is the implementation stage where developers are gathering input about the product. Austin says that this basically means, “Implementation may vary. Enter at your own risk.”

[00:16:21] If I’m using New Relic, is it using Zone JS under the hood?

Austin is unsure but there something like that has to be done if profiling is being used. There has to be a way that you insert yourself in between calls. Zone is doing that while providing context, but probably not using Zone JS. There is a similar implementation to tracing and inserting logging in between all calls and timeouts.

[00:17:22] What are the nuances? Why isn’t everybody doing this?

Zone is still new in the JavaScript world, meaning everyone has a ton of ideas about what should be done. It can be frustrating to work with Zone in front-end development because it has to be manually learned. But in terms of implementation, only trying to create a context. Austin recommends Zone if people want to create direct contacts. The exception would be 100 lines of Zone traces because they can get difficult.

Another issue Austin has is Node’s native basic weight. Weight hooks are still up in the air. The team is currently waiting on the Node JS community to provide additional information so that they can finish. Context can get lost sometimes if the wrong language is used. He is using Typescript and doesn’t have that problem because it is straightforward.

[00:21:44:] Does this affect your ability to test your software at all?

No, there have not been any issues with testing. One thing to accommodate for is if you are expecting certain contexts to be present you have to mock for those in the tests. After that happens, the tests should have no problems.

Picks

Cory:

• Apple AirPods

Aimee:​

• Blackmill
• Understanding Zones

Charles:

• Classical Reading Playlist on Amazon
• Building stairs for his dad
• Angular Dev Summit 

Austin:

• NGRX Library Redux 

Links

• Twitter
• GitHub

Panel: 

Charles Max Wood

Guest: Austin McDaniel

This week on My JavaScript Story/My Angular Story, Charles speaks with Austin McDaniel. Austin is a return guest and was previously featured on JavaScript Jabber episode 275 . Austin talks about his journey getting into programming as an 11year old, to recently, as a web developer with more complex technologies. Austin talks about building widgets, working in Angular, JavaScript, and more in-depth web development on many different platforms. Lastly, Austin talks about his contributions to NGX Charts and speaking at a variety of developer conferences.

In particular, we dive pretty deep on: 

• How did you get into programming? 11 years old
• Cue Basic
• Web developer
• College jobs was in web developing
• IE6
• Building Widgets
• Components
• jquery 
• Web is the future
• How did you get into Angular? 2013, v1.2
• Backbone
• Angular 1 & 2
• NG X Charts
• Speaking at Conferences
• Augmented Reality and VR
• Web AR
• Angular Air Podcast
• Working as a contractor with Google
• and much, much more!

Links: 

• JavaScript Jabber episode 275
• jquery
• http://amcdnl.com
• Angular Air Podcast
• @amcdnl
• github.com/amcdnl
•  

Picks

Austin

• Todd Motto 

Charles

• NG Conf
• Angular Dev Summit
• Angular Air Podcast

Panel:

• Charles Max Wood
• AJ ONeal

Special Guests: Kurt Mackey

In this episode, the JavaScript Jabber panel talks to Kurt Mackey about Fly.io. At Fly.io, they are "building a JavaScript platform that gives you the power to build your own CDN." They talk about how Fly.io came to fruition, how CDN caching works, and what happens when you deploy a Fly app. They also touch on resizing images with Fly, how you actually build JavaScript platforms using Fly, and more!

In particular, we dive pretty deep on:

• Fly.io
• Building a programmable CDN
• High level overview of Fly.io
• How did this project come together?
• CDNs didn’t work with dynamic applications
• Has been working on this since 2008
• Extend application logic to the “edge”
• Putting burden of JavaScript “nastiest” onto the web server
• Fly is the proxy layer
• Getting things closer to visitors and users
• CDN caching
• Cache APIs
• Writing logic to improve your lighthouse score
• Have you built in resizing images into Fly?
• Managing assets closer to the user
• Can you modify your own JavaScript files?
• What happens when you deploy a Fly app
• Having more application logic
• DOM within the proxy
• Ghost
• React and Gatsby
• Intelligently loading client JavaScript
• How do you build the JavaScript platform?
• And much, much more!

Links:

• Fly.io
• JavaScript
• Ghost
• Gatsby
• React
• @flydotio
• @mrkurt
• Kurt at ARS Technica
• Kurt’s GitHub

Sponsors

• Kendo UI
• Sentry
• Digital Ocean

Picks:

Charles

• GitLab

AJ

• Gitea
• Black Panther

Kurt

• Packet.net
• The Three-Body Problem by Cixin Liu

Journalist. Scrapbooks, diaries, clippings, correspondence, photographs, legal reports, ephemera, and other papers relating to A. B. MacDonald’s career at the Kansas City Star and other publications, his family life and history, and his personal interests. Includes material concerning his coverage of the Leo Frank lynching of 1915, diaries documenting MacDonald’s time with Billy Sunday’s...

Jacobson, Susan Kay, author

Runion, Meryl

McDonald, Roger B., author

£Attractive: EPSRC & SFI Centre for Doctoral Training in Advanced Metallic Systems (AMS-CDT)
For more latest jobs and jobs in North East England visit brightrecruits.com

€Competitive: CERN
For more latest jobs and jobs in Switzerland visit brightrecruits.com

The tests can still be used, CDC says, as urgency over possible outbreak grows

Early batches of the test can still be used, CDC says, while affirming it will deploy new kits

Hayden Library - QC174.13.S55 2018

Rotch Library - HT166.M233 2019

Rotch Library - HT178.A78 K63 2018

“There is absolutely no income coming our way due to the Covid-induced lockdown for over a month. As a result, most companies are facing the problem of paying the employee salaries in full for the month of April,” said National Restaurant Association of India president Anurag Katriar.

The US burger and fries giant has joined other restaurant chains including Jubilant FoodWorks-operated Domino's Pizza, Tata Starbucks and Speciality Restaurants in seeking waivers from landlords and mall owners.

You are subscribed to Cataloging Products and Services News for Library of Congress. This information has recently been updated, and is now available.

You are subscribed to Cataloging Products and Services News for Library of Congress. This information has recently been updated, and is now available.

Hayden Library - LB1060.B768 2014

The guidance contained detailed advice for making site-specific decisions related to reopening schools, restaurants, summer camps, churches, day care centers and other institutions

Interview with Martin E. Franklin, PhD, author of Cognitive Behavior Therapy Augmentation of Pharmacotherapy in Pediatric Obsessive-Compulsive Disorder: The Pediatric OCD Treatment Study II (POTS II) Randomized Controlled Trial

Interview with Victor R. Fuchs, PhD, author of How and Why US Health Care Differs From That in Other OECD Countries

Interview with Tracy Y. Wang, MD, MHS, MSc, author of Implantable Cardioverter-Defibrillator Use Among Medicare Patients With Low Ejection Fraction After Acute Myocardial Infarction

This Medical News podcast features a Q&A with CDC Director Tom Frieden, MD, commemorating the agency’s historic 70th anniversary. The interview was recorded on August 8th, 2016.

Coronavirus testing will help countries manage coronavirus disease 2019 (COVID-19) but will raise questions about how to counsel patients about their test results. The CDC's Deputy Director for Infectious Diseases Jay C. Butler, MD, talks with JAMA Editor Howard Bauchner about what to advise healthy patients with positive PCR results, sick patients with negative test results, exposed health care workers, and more.

Anne Schuchat, MD, Principal Deputy Director of the Centers for Disease Control and Prevention (CDC), discusses evolution of CDC guidance and latest developments in the COVID-19 pandemic. Recorded Friday May 1, 2020.

Hayden Library - TL781.8.U5 M23 2019

Rotch Library - ML189.M87 2019

Rotch Library - NA9415.I78 2006

The Centers for Disease Control and Prevention (CDC) and the Department of Labor (DOL) have issued guidance specific to the meat and poultry processing industry in order to facilitate ongoing operations and support the food supply, while also mitigating the risk of spreading COVID-19.

McDonald, Meme, 1954-2017

Barker Library - PN6728.F437 C48 2018