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Today in Top Angular News – Sunday, February 10

Today in Top Angular News – Sunday, February 10

Today’s topics include javascript, react, vuejs, angular, reactjs, es6, web, Polymer, AngularJS, AutoTweet, Ivy, ITNEXT, CleanCode, VSCode, AngularConsole, ngIndia, briebug, Course, and Training. Special thanks to contributors @lcjfifty, Luke Joliat, @a.yurich.zuev, Alexey Zuev, @stephenfluin, Stephen Fluin, @mathis.garberg, Mathis Garberg, @dleroari, Dler Ari, 10208572694571329, Victor Savkin, @shijirtsogoo, Shijir Tsogoo, @nishu0505, Nishu Goel, @rockytopsolutions, Rocky Top Solutions, @inorganik, Jamie Perkins, Juri Strumpflohner, pravallikabandaru, and @Anderson7301, Andrew Anderson.

Do we still need JavaScript frameworks? –

Put simply, a JavaScript framework is a tool that you can leverage to develop advanced web applications, especially SPAs. Most front end frameworks/libraries, from Vue to React, provide some combination of the following:
Synchronization of state and view
A Template System
Reusable components

Are Frameworks still necessary? It’s hard to say, but advances in native JS, the web component spec, and easily configurable build tools, have made developing a SPA without a framework as easy as it has ever been. Angular app bundleRecipes app bundleUnderstanding
If you’ve only really developed with a framework and its CLI, it can be a great exercise to make a web application without extra tools. There are I’m sure many other ways of developing a SPA or front end application in general without a major framework or library, I tried one way here, and I’d love to hear about others! Continue reading

Angular DI: Getting to know the Ivy NodeInjector – Angular In Depth

The NodeInjector is going to replace the current Element injector(Injector_ in the picture above) and reduce memory pressure in an Angular application by using bloom filter. Cumulative and template bloom filters
If you are not familiar with bloom filter you might be interested in these great articles: Probabilistic Data structures: Bloom filter and Bloom Filters by ExampleIn Angular Ivy we have a quite interesting implementation of bloom filter. First, Angular generates(if it is not defined yet) a unique ID for token via incrementing integer value and puts it to static __NG_ELEMENT_ID__ property:
Note: our AppComponent got 0 id since the token generation starts with 0 and AppComponent is the first directive which Angular adds to the injection system.Then, it takes that number and fits it to the bloom size through bitwise AND() operator so that the result is always between 0–255. const BLOOM_SIZE = 256;
const BLOOM_MASK = BLOOM_SIZE – 1; // 255/* it's like a remainder operator
* so that all unique ids are modulo-ed
* into a number between 0-255
const bloomBit = id BLOOM_MASK;

0 255 // 0
1 255 // 1
255 255 // 255
256 255 // 0
257 255 // 1
1000 255 // 232Finally, Ivy creates a mask using that bloomBit:
const mask = 1 bloomBit;and sets that mask in one of 8 buckets depending on bloomBit:
So, for all possible Ids, that are modulo-ed into a number between 0–255, we always get the following structure of bloom filter:
Ids 0-31
1 bucket
\____________32 bits___________/ Ids 32-63
2 bucket
… Ids 224 – 255
8 bucket Okay, a lot is going here. Also, as we learned before after each bloom filter Angular also stores parentLocation pointer in LView array so that we can walk through all parent injectors. Continue reading

A plan for version 8.0 and Ivy – Angular Blog

We are planning on having Ivy as an opt-in preview as part of the version 8.0 release in Q2 of this year. Opt-in Ivy Preview
Get a preview of how your application will work with Ivy, and give us feedback so we can incorporate necessary changes and improvements into the full release. In the opt-in preview, you can expect:
Generated code that is easier to read and debug at runtime
Faster re-build time
Improved payload size (Real world applications should see some size improvements, but many more improvements are planned)
Improved template type checking
Great backwards compatibility

Ivy will not be ready for all use cases. This opt-in preview is focused on moving applications to the Ivy compiler and runtime instructions without requiring developers to rewrite their applications. We’ll be using the opt-in preview of Ivy in 8.0.0 to validate our promises about backwards compatibility and to work on any automated migration tools we might need. Continue reading

If you need something specific from the payload object, you can pass it directly into the handler function with one of the event properties:
button is another peculiar Angular event feature in relation to keyup and keydown events. Another limitation to event binding is that you cannot listen to events on your component’s host element, which wraps the component’s template. Even though you cannot listen to events outside of the component’s template, you can listen to events on global elements such as window, document, and body with event binding. Something else a normal Angular event binding can handle are events that bubble up to a parent component from a child component. Finally, the last thing to note about event binding is that you cannot dynamically add or remove the listener once event binding is set on an element in the component template. Continue reading

Angular Unit Testing with Google reCAPTCHA components

My website UI is built using Angular 7, and I was using ngx-captcha to add Google’s reCAPTCHA field to my forms. It is definitely one of the best and easiest to use third party Angular components to incorporate reCAPTCHA into your Angular applications. However, like many other third party Angular components I tried to use to incorporate reCAPTCHA into my site, I was getting errors while running my unit tests. The main issue was that there was a timing issue between when Angular loaded and discarded the components and when Google’s remote reCAPTCHA script was able to load. So I added the following to my beforeEach() method in the unit test files where I was using the ngx-captcha component and the parent components that directly encompassed the Angular component using ngx-captcha. Continue reading

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