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Today in Top Angular News – Friday, November 16

Today in Top Angular News – Friday, November 16

Today’s topics include Angular, RxJS, Observables, JavaScript, ReverseEngineering, AngularJS, Vuejs, Top10, VueCLI, TDD, Debugging, Nuxtjs, Unittest, VueCLIplugin, frontend, 100daysofcode, and angularconnect. Special thanks to contributors +Era Balliu, Era Balliu, @natelapinski, Nate Lapinski, Check Authorization With Policies Before Delete Function, @Mybridge, Mybridge, @tomsu, Tomek Sułkowski, webcodegeeks, haleyjason, NG_Tutorial, afaber, and K_Rostyslav.


Angular.js Components Example

A directive is a feature all by itself, while a component is a piece of code that can be plugged into another body of code and be expected to behave as we want it to. To put it simply, a directive is a component that works off of the inputs given and it can be used in any template anywhere and uses a simpler configuration which is suitable for a component-based application structure. By definition, an AngularJS Component is a special kind of directive that uses a simpler configuration, suitable for a component-based application structure. Take a look at the code below:

This line of code, which you’ll notice that we have placed in a separate HTML file, is all what our Component as a DOM element will include. Another main difference is that while directives have compile functions, components do not, which is one of the reasons we can’t use directives when adding event listeners, or when we have to do with elements that require DOM manipulation. Continue reading


How to Read the RxJS 6 Sources Part 1: Understanding of() and Subscriptions

On lines 5 and 6, we see that the subscriber's next method will be called with ‘World’, and then it will complete (since it’s just a scalar value, i.e. singular). Notice how the string value 'World' was unpacked from the observable along the way… 🤔
Btw, the best variable name ever:
love the sense of humor 😂:D
of() with multiple args
Now I’ll try passing the strings 'Hello' and 'World' into of, because I want to see how fromArray works:

On line 88, args is ['Hello', 'World'] and scheduler is undefined. Here’s It’s a function which takes an ArrayLike (in this case, [‘Hello’, ‘World’]) and then returns a function which takes a subscriber (again, think observer), and then loops over each element in the array, calls subscriber.next(array[i]), and then completes the subscriber on line 12 once it has iterated through each value in the array. This is very similar to how scalar worked, expect it calls next for each value in the array 😀
Remember, subscribeToArray is just returning a function which accepts a subscriber, and that is being passed into the returned observable (line 8 of fromArray). No data is running through the observable just yet, but once I subscribe to the observable returned from fromArray, it knows to iterate through the array [‘Hello’, ‘World’] and call the next method of whatever observer I pass into subscribe once for each item in the array. Continue reading


Angular Templates and Styles – Vegibit

Angular performs it’s magic by the interaction of a component class instance and its user-facing template. component.ts file below, the templateUrl property is highlighted showing that the html file is the file that is responsible for providing the template for this component. If you have just a small amount of markup, it might be convenient to make use of the inline approach of angular templates. Just like we saw with the template and the ability to point to an external HTML file, so too can you reference an inidual CSS file for any styles you want to apply to a component. Just like with the template approach, you can choose whether to use inline styles with the styles property or external styles by using the styleUrls. Continue reading


Vue.js Top 10 Articles for the Past Month (v.Nov 2018)

Vue.js Top 10 Articles for the Past Month (v.Nov 2018)
For the past month, we ranked nearly 1,000 Vue.js articles to pick the Top 10 stories that can help advance your career (1% chance). Tweet of the monthTopics in this list: Authentication System, Devtools v5.0, Vue CLI 3, TDD, Debugging, Angular, Nuxt.js, Sass, Unit test, Vue CLI plugin
“Watch” Vue.js Monthly Top 10 on Github and get email once a month. This is a competitive list and you’ll find the experience and techniques shared by the Vue.js leaders useful. Course of the month:
A) Beginners: Vue JS 2 — The Complete Guide (incl. [787 recommends, 4.8/5 stars]

Vue.js Authentication System with Node.js Backend | Jscrambler Blog. Continue reading


With `ViewEncapsulation.Emulated`, global styles also don’t impact a descendant component.The solution
To deal with this, we are going to use CSS Custom Properties, a.k.a. CSS variables. Property names that are prefixed with –, like –example-name, represent custom properties that contain a value that can be used in other declarations using the var() function.What it means is that you define a custom property the same way as you would a normal css property, e.g. "font-size: 16px" and it’s available to be referenced everywhere within the cascade (in the whole subtree of element that matched the selector you’ve used when defining the property.) Now, if you haven’t work with css custom properties before it takes a while to sink in (speaking from experience…), but it’s an extremely powerful tool.The important thing is not to think of them as an alternative to SASS, or Less variables — these are only calculated during compilation, so they’re static. You don’t actually have to put the custom properties [dtTheme] directly on a component, it can be applied on any HTML element in your app. The theme will be applied to everything inside:

[dtTheme]="getCustomTheme()"
dt-ptero/dt-ptero
dt-trex/dt-trex
/I’m using both custom CSS properties and SASS variables there. Continue reading

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