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Talia Berkowitz discusses the use of a math app at home to boost math achievement at school, Catherine Matacic talks about the fate of animals near Chernobyl, a potential kitty contraceptive, and where spiders got their knees. Hosted by Sarah Crespi.

Both companies said privacy and preventing governments from using the system to compile data on citizens was a primary goal

The panelists talk about refactoring JavaScript Apps Into a Framework with Brandon Hays.

The panelists talk about Chrome apps with Google's Joe Marini.

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JSJ BONUS: Web Apps on Linux with Jeremy Likness and Michael Crump

In this episode Aimee Knight and Charles Max Wood discuss Microsoft's Web Apps on Linux offering with Jeremy Likness and Michael Crump.

[00:37] Michael Crump Introduction

Michael is on the developer experience team for Azure.

[00:52] Jeremy Likness Introduction

Jeremy is on the cloud developer advocacy team. Their mission is to remove friction and support developers and work with teams to build a positive experience.

The NodeJS team is headed up by John Papa. They have teams around the world and involved in many open source communities.

They're focused on building documentation and creating great experiences

[02:54] What is it about Azure that people should be getting excited about?

Azure is a huge platform. It can be overwhelming. They're trying to help you start with your problem and then see the solution as it exists on Azure.

Azure is growing to embrace the needs of developers as they solve these problems.

The experience is intended to be open and easy to use for any developer in any language on any platform. It allows you to work in whatever environment you want.

Standing up applications in production is tough. Azure provides services and facilities (and interfaces) that make it easy to manage infrastructure.

You don't have to be an operations expert.

Chuck mentions this messaging as he heard it at Microsoft Connect() last year.

It's not about bringing you to .NET. It's about making it easy where you're at.

Aimee adds that as a new-ish person in the community and Azure excites her because the portal and tutorials are easy to follow for many new programmers.

A lot of these features are available across command lines, tools, and much more.

The documentation is great. See our interview with Dan Fernandez on the Microsoft Docs.

[12:04] Web Apps on Linux

Web application as a service offering from Microsoft. I don't need to worry about the platform, just what's different about my application.

Web Apps has traditionally been on Windows. Web Apps on Linux is in preview.

You can choose the size of your infrastructure. You only get billed for what you use and can scale up.

Setting up multiple servers, managing synchronization and load balancing is a pain. Web Apps gives you a clean interface that makes this management easy.

You can also scale across multiple datacenters around the world.

[15:06] Why Linux? What's hard about Windows?

Node was originally created on Linux and many tools run nicely on Linux. It was later ported to Windows.

The toolchains and IDE's and build processes is in an ecosystem that is targeted more toward Linux than Windows.

This allows people to work in an environment that operates how they expect instead of trying to map to an underlying Windows kernel.

Aimee gives the example of trying to set up ImageMagick on Windows.

Web Apps on Linux also allows you to build integrations with your tools that let you build, test, and deploy your application automatically.

[19:12] Supported Runtimes

Web Apps on Linux supports Node, PHP, Ruby, and .NET Core.

You can run a docker container with Node up to 6.x. If you want Node 7.x and 8.x you can create your own Docker container.

Web Apps on Linux is build on Docker.

The containers also have SSH, so developers can log into the docker container and troubleshoot problems on the container.

If you can build a container, you can also run it on this service.

At certain levels, there's automatic scaling.

[22:06] Consistency between containers? Shared ownership of state or assets

It depends on how you build your app. The Docker containers have a shared storage where all the containers have access to the same data and state.

There's a system called kudu that makes this really simple.

You can also pull logs across all systems.

You can also use SSH in the browser

[25:23] What's painful about Linux and containers?

How is the application built and how does it manage state so that you can isolate issues.

If you have 20 containers, can you connect to the right one.

It's up to you to manage correlation between containers so you can find the information you need.

Knowing your traffic and understanding what to do to prepare for it with scaling and automation is sometimes more art than science.

[28:28] How should you manage state?

A lot of these systems lend themselves to running stateless, but you don't want to run mongodb on each container versus running one mongodb instance that everything attaches. You want a common place to store data for the entire app for shared state.

[30:34] CosmosDB (was DocumentDB)

It's an API equivalent to MongoDB. It's a database as a service and you can connect your containers to the CosmosDB in Azure using your portal to make it super easy.

You may need to open up some firewall rules, but it should be pretty straightforward.

[34:14] Third Party Logging Management Apps

Azure has a service that provides metrics (Application Insights) and a logging service. Many other companies use elasticsearch based solutions that solve some of these problems as well.

[36:06] How do people use Web Apps on Linux?

Companies building new applications many times want to run without managing any infrastructure. So, they use Azure Functions, and other services on Azure.

Lift and shift: Take a virtual machine and change it into a web app container that they can run in the cloud. They also move from SQL Server on a server to SQL Server on the cloud. Moving from hosted MongoDB to CosmosDB.

You can also use any images on DockerHub.

[40:06] Continuous Integration and Continuous Deployment

Whether you're using a private registry or cloud registry. When you publish a new image, it'll use a webhook to pull the custom image and deploy it. Or to run it through Continuous Integration and then deploy it without any human interaction.

Chuck mentions the case when you haven't logged into a server for a while, there's a huge backlog of system updates. Updating your container definitions makes upkeep automatic.

[42:02] Process files and workers with PM2 format

You can set up instances to run across cores with the PM2 definitions. You can also make it run various types of workers on different containers.

Why did you use PM2? What other uses are there for this kind of setup?

You can tell it which processes to start up on boot. You can also have it restart processes when a file is changed, for example, with a config file you can have it restart the processes that run off that config file.

[45:38] How to get started

Getting started with Node

docs.microsoft.com

Trial account with a few hundred dollars in Azure credit.

Michael's Links

• michaelcrump.net
• @mbcrump
• github.com/mbcrump

Jeremy's Links

• bit.ly/coderblog
• @jeremylikness
• github/jeremylikness

Picks

Aimee

• Having a little bit of mindfulness while waiting on code and tests to run.

Joe

• Ozark on Netflix
• Star Wars: Rogue One

Chuck

• Travelers on Netflix

Jeremy

• Ozark filming in Woodstock, GA
• Autonomous Smart Desk
• LED light strips

Michael

• Conference Call Bingo
• Life (Movie)
• Get Out (Movie)

Panel:

• Charles Max Wood

Special Guests: Evan Hahn

In this episode, the JavaScript Jabber panelists discuss securing Express apps with Helmet.js with Evan Hahn. Evan is a developer at Airtable, which is a company that builds spreadsheet applications that are powerful enough that you can make applications with. He has also worked at Braintree, which does payment processing for companies. They talk about what Helmet.js is, when you would want to use it, and why it can help secure your Express apps. They also touch on when you wouldn’t want to use Helmet and the biggest thing that it saves you from in your code.

In particular, we dive pretty deep on:

• Evan intro
• JavaScript
• What is Helmet.js?
• Node and Express
• Why would you use the approach of Middleware?
• Helmet is not the only solution
• Http headers
• Current maintainer of Helmet.js
• npm
• Has added a lot to the project, but is not the original creator
• Outbound HTTP response headers
• Helmet doesn’t fully secure your app but it does help secure it
• How does using Helmet work?
• Are there instances when you wouldn’t want to use Helmet?
• No cash middleware
• Where do you set the configuration options?
• Top level Helmet module
• 12 modules
• What is the biggest thing that Helmet saves you from?
• Content security policy code
• And much, much more!

Links:

• Airtable
• Braintree
• JavaScript
• Helmet.js
• Node
• Express
• npm
• Evan’s Website
• @EvanHahn
• Evan’s GitHub

Picks:

Charles

• Camera
• Zoom H6
• Shure SM58
• DevChat.tv Youtube
• React Round Up

Evan

• Clojure
• Fortune
• Kantaro: The Sweet Tooth Salaryman

Sponsors

• Sentry use the code “devchat” for $100 credit
• Triplebyte
• Clubhouse
• CacheFly

Panel

• Charles Max Wood

Joined by special guest: Aaron Gustafson

Episode Summary 

This episode of JavaScript Jabber comes to you live from Microsoft Ignite. Charles Max Wood talks to Aaron Gustafson who has been a Web Developer for more than 20 years and is also the Editor in Chief at “A List Apart”. Aaron gives a brief background on his work in the web community, explains to listeners how web standardization has evolved over time, where Progressive Web Apps (PWAs) come from, where and how can they be installed, differences between them and regular websites and their advantages. They then delve into more technical details about service workers, factors affecting the boot up time of JavaScript apps, best practices and features that are available with PWAs. 

Aaron mentions some resources people can use to learn about PWAs, talks about how every website can benefit from being a PWA, new features being introduced and the PWA vs Electron comparison. In the end, they also talk about life in general, that understanding what people have gone through and empathizing with them is important, as well as not making judgements based on people’s background, gender, race, health issues and so on.

Links

• Creating & Enhancing Netscape Web Pages
• A List Apart
• A Progressive Roadmap for your Progressive Web App
• Windows Dev Center - Progressive Web Apps
• MDN web docs
• PWA Stats
• PWA Stats Twitter
• Aaron’s website
• Aaron’s Twitter
• https://www.facebook.com/javascriptjabber/
• https://twitter.com/JSJabber

Picks

Aaron Gustafson:

• Homegoing
• Zeitoun

Charles Max Wood:

• Armada 

Sponsors

• Datadog  

• Sentry use code “devchat” for 2 months free

Panel

• Aimee Knight

• AJ O’Neal

• Charles Max Wood

With Special Guest: Rene Rubalcava

Episode Summary

Rene is a software developer for ESRI and works in spatial and mapping software. ESRI has been around since 1969 and has seen their work explode since they shifted to providing address and location services. Rene talks about how he thinks about location and mapping when building software around it and things that he has to approach in unique ways. The panel discusses some of their past experiences with location software. Some of the most difficult aspects of this software is changing time zones for data and actually mapping the Earth, since it is not flat nor a perfect sphere. Rene talks about the different models used for mapping the Earth.

Most mapping systems use the same algorithm as Google maps, so Rene talks about some of the specific features of ArcGIS, including the ability to finding a point within a polygon. Rene talks about what routing is, its importance, and how it is being optimized with ArcGIS, such as being able to add private streets into a regular street network.

The panel discusses how the prevalence of smartphones has changed mapping and GPS and some of their concerns with privacy and location mapping. One thing ESRI is very careful about is not storing private information. Rene talks about the kinds of things he has seen people doing with the mapping and location data provided by ArcGIS, including a Smart Mapping feature for developers, mapping planets, indoor routing, and 3D models. 

Links

• Webricate 

• Esri

• ArcGIS

Follow DevChat on Facebook and Twitter

Picks

Rene Rubalcava:

• Old Man’s War series

• Always Be My Maybe

• Rene’s website

AJ O’Neal:

• INTL

• Colorful

• Time zones in Postgress

• Time zones in JavaScript

Aimee Knight:

• Advice to Less Experienced Developers

Charles Max Wood:

• Heber Half Marathon

• Netlify CMS

• Villainous

• Firefox

Maximiliano Firtman is a mobile web developer from Buenos Ares, Argentina. He has been a developer for 24 years and his most recent focus has been on progressive web apps, or PWAs. Steve and Max reflect on the technologies they were using when they first got started in web development and talk about their experience with mobile development. One area that Max emphasized was bringing the web into the mobile space. They discuss the progression of web access on mobile and some of the available tools. Max notes that responsible design has a very high cost in web performance for mobile devices, which requires unique approaches. They discuss some of the issues with latency in mobile, even on 4G. The solution to this latency is PWAs.

Progressive web apps are a set of best practices to create web apps that are installable. They can work offline at high speeds on several operating systems. Once installed, it looks like any other app on the system. Max delves into more details on how it works. He talks about how the resources for your application are managed. He assures listeners that it’s just a website that’s using a new API, they’re not changing the way the web works, and that when that API is there, the app can be installed. It will also generally use your default browser. Steve and Max discuss how local data is stored with PWAs. To write PWAs, you can use Angular, React, JavaScript, or Vue, and it’s a pretty transparent process. Max talks about some common tools used for local storage and some of the PWAs he’s worked on in the past. The benefit of using PWAs is that they generally run faster than regular web apps. To get started, Max advises listeners to install one and start exploring.

Panelists

• Steve Edwards

Guest

• Maximiliano Firtman

Sponsors

• G2i

____________________________

"The MaxCoders Guide to Finding Your Dream Developer Job" by Charles Max Wood is now available on Amazon. Get Your Copy Today!

____________________________________________________________

Links

• Progressive Web Apps

• Appsco.pe

• IndexedDB

• Max's site

Picks

Steve Edwards:

• The Club

Maximiliano Firtman:

• Llama

• Follow Max on Twitter

Using SVG is currently the best way to create icon libraries for apps. Icons built with SVG are scalable and adjustable, but also discrete, which allows them to be incrementally loaded and updated. In contrast, icons built as fonts cannot be incrementally loaded or updated. This alone makes SVG icons the better choice for high-performance apps that rely on code-splitting and incremental deploys.

This post describes how to make a package of React components from a library of SVG icons. Although I’m focusing on React, making any other type of package is also possible. At Twitter I used the approach described here to publish the company’s SVG icon library in several different formats: optimized SVGs, plain JavaScript modules, React DOM components, and React Native components.

Using the icons

The end result is a JavaScript package that can be installed and used like any other JavaScript package.

yarnpkg add @acme/react-icons

Each icon is available as an individually exported React component.

import IconCamera from '@acme/react-icons/camera';

This allows your module bundler to package only the icons that are needed, and icons can be efficiently split across chunks when using code-splitting. This is a significant advantage over icon libraries that require fonts and bundle all icons into a single component.

// entire icon library is bundled with your app
import Icon from '@acme/react-icons';
const IconCamera = <Icon name='camera' />;

Each icon is straightforward to customize (e.g., color and dimensions) on a per-use basis.

import IconCamera from '@twitter/react-icons/camera';
const Icon = (
  <IconCamera
    style={{ color: 'white', height: '2em' }}
  />
);

Although the icons render to SVG, this is an implementation detail that isn’t exposed to users of the components.

Creating components

Each React component renders an inline SVG, using path and dimensions data extracted from the SVG source files. A helper function called createIconComponent means that only a few lines of boilerplate are needed to create a component from SVG data.

import createIconComponent from './utils/createIconComponent';
import React from 'react';
const IconCamera = createIconComponent({
  content: <g><path d='...'></g>,
  height: 24,
  width: 24
});
IconCamera.displayName = 'IconCamera';
export default IconCamera;

This is an example of what the createIconComponent function looks like when building components for a web app like Twitter Lite, which is built with React Native for Web.

// createIconComponent.js
import { createElement, StyleSheet } from 'react-native-web';
import React from 'react';

const createIconComponent = ({ content, height, width }) =>
  (initialProps) => {
    const props = {
      ...initialProps,
      style: StyleSheet.compose(styles.root, initialProps.style),
      viewBox: `0 0 ${width} ${height}`
    };

    return createElement('svg', props, content);
  };

const styles = StyleSheet.create({
  root: {
    display: 'inline-block',
    fill: 'currentcolor',
    height: '1.25em',
    maxWidth: '100%',
    position: 'relative',
    userSelect: 'none',
    textAlignVertical: 'text-bottom'
  }
});

Setting the fill style to currentcolor allows you to control the color of the SVG using the color style property instead.

All that’s left is to use scripts to process the SVGs and generate each React component.

Creating icon packages

A complete example of one way to do this can be found in the icon-builder-example repository on GitHub.

The project structure of the example tool looks like this.

.
├── README.md
├── package.json
├── scripts/
    ├── build.js
    ├── createReactPackage.js
    └── svgOptimize.js
└── src/
    ├── alerts.svg
    ├── camera.svg
    ├── circle.svg
    └── ...

The build script uses SVGO to optimize the SVGs, extract SVG path data, and extract metadata. The example packager for React then uses templates to create a package.json and the React icon components shown earlier.

import createIconComponent from './utils/createIconComponent';
import React from 'react';
const ${componentName} = createIconComponent({
  height: ${height},
  width: ${width},
  content: <g>${paths}</g>
});
${componentName}.displayName = '${componentName}';
export default ${componentName};

Additional packagers can be included to build other package types from the same SVG source. When the underlying icon library changes, it only takes a couple of commands to rebuild hundreds of icons and publish new versions of each package.

Apple has introduced new Apple Watch cases and bands, available starting today, including new gold and rose gold aluminum Apple Watch Sport models. watchOS 2 — which arrives as a free update on September 16 — makes apps faster and more fluid by running natively on Apple Watch, and introduces new watch faces, the ability for third-party apps to display information on the watch face as complications, and an innovative way to see future events, past headlines, and more with Time Travel. Apple Watch collections are expanding with new case colors and fresh new bands. With new standalone Sport Bands that range from rich vibrant colors to more neutral tones, Apple Watch is now more customizable than ever.

Apple today announced CareKit, a new software framework designed to help developers enable people to actively manage their own medical conditions. iPhone apps using CareKit make it easier for individuals to keep track of care plans and monitor symptoms and medication, providing insights that help people better understand their own health. “We believe that giving individuals the tools to understand what is happening with their health is incredibly powerful, and apps designed using CareKit make this a reality by empowering people to take a more active role in their care,” said Jeff Williams, Apple’s chief operating officer.

Fate of business travel could hang on Covid-19 tracing apps - Times of India

Adapting an app’s design to another platform is crucial. But what exactly sets design for iOS and Android apart? Let’s see.

Apps are improving the earnings of thousands of truckers by using data science and a host of technologies such as telematics, artificial intelligence, machine learning and Internet of Things. Peerzada Abrar reports.