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Today in Top Angular News – Sunday, November 25

Today in Top Angular News – Sunday, November 25

Today’s topics include angular7, angular6, AngularJS, Versioning, Dev, Tech, AutoTweet, javascript, typescript, Fullstack, React, Python, appdevelopment, webdevelopment, FrontEnd, MongoDB, bootstrap, and npm. Special thanks to contributors Anil Singh, +Yatin, Yatin, @NetanelBasal, Netanel Basal, mostlyjason, chidumennamdi, Samiullah Khan, Alyssa Nicoll, anastasionico, excellentweb, geekstrick, and anilsingh581.


Angular 7, 6, 5, 4, 2 Interview Questions Books

You are new or have some experience in Angular and now want to take the step to became an expert in Angular and want to learn more about how you can apply the new concepts specifically for an Interview or developing robust web apps as well as mobile apps.This book has the collection of Angular 2 Interview Questions and Answers with TypeScript. As you know, Angular 2 is a most popular framework for developing mobile as well as web applications. Angular 2 is so simpler, faster, modular and instrumented design and it is developed by Google and Misko Hevery is the father of Angular. Continue reading


AngularJS Directives Example

Hello readers, in this basic example, developers will learn what AngularJS is and how to use the angular directives in the angular applications. Below is the list of the important directives that are available in the angular library:

An expression is like a JavaScript code usually wrapped inside the double curly braces such as . Therefore, let us create a simple application using the important angular directives. It will have the following code:

Let’s create an application to understand the basic building blocks of the angular directives. In this step, we’ll define the angular directives to show their usage in the angular applications. Continue reading


Demystifying the Dependency Inversion Principle in Angular

This D refers to the Dependency Inversion Principle
If you are not familiar with the SOLID principles, I highly recommend you learn them. This principle’s primary suggestion is this:
Depend on abstractions, not on concretions.This entire principle is about decoupling code. Now, thanks to the Angular Dependency Injection mechanism, if we want to swap the implementation for our entire application, we can do the following:
Socket IO ImplementationAnd we can do all that without changing anything in our codebase. The last thing worth noting is that in other “real” OOP languages, like Java or PHP for example, this concept is achieved with Interface rather than Class, (You’ve probably heard the term “Coding to an Interface”)
In typescript, we can’t use Interface, because Interface doesn’t have a runtime representation. Summary
We learned about the Dependency Inversion Principle, and we saw how not to tie our application to a specific implantation, but rather an abstraction. Continue reading


Error Handling with Angular 6 – Tips and Best Practices

For reference, you can check our earlier tutorial on how to use [ErrorHandler in Angular implementing error handling in HttpClient or HttpInterceptor, you can work directly with all HTTP requests in your application, providing the ability to transform the request, retry it, and more. Here is an example service which uses this basic form of error handling:

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { retry, catchError } from 'rxjs/operators';
import { User } from providedIn: 'root'
})
export class UserService {
private apiUrl = constructor(private http: HttpClient) { }

getUsers(): ObservableUser[] {
return . In the following example, we implement an interceptor to handle errors across our {
HttpEvent,
HttpInterceptor,
HttpHandler,
HttpRequest,
HttpResponse,
HttpErrorResponse
} from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { retry, catchError } from 'rxjs/operators';

export class HttpErrorInterceptor implements HttpInterceptor {
intercept(request: HttpRequestany, next: HttpHandler): ObservableHttpEventany {
return next.handle(request)
. pipe(
retry(1),
catchError((error: HttpErrorResponse) = {
let errorMessage = '';
if (error.error instanceof ErrorEvent) {

errorMessage = `Error: ${error.error.message}`;
} else {

errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;
}
window.alert(errorMessage);
return throwError(errorMessage);
})
)
}
}
**app.module.ts:**

import { NgModule } from '@angular/core';
import { BrowserModule } from { HttpClientModule, HTTP_INTERCEPTORS } from { AppComponent } from '. /app.component';
import { HttpErrorInterceptor } from imports: [ BrowserModule, HttpClientModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ],
providers: [
{
provide: HTTP_INTERCEPTORS,
useClass: HttpErrorInterceptor,
multi: true
}
]
})
export class AppModule { }
**user.service.ts:**

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { retry, catchError } from 'rxjs/operators';
import { User } from providedIn: 'root'
})
export class UserService {
private apiUrl = constructor(private http: HttpClient) { }

getUsers(): ObservableUser[] {
return }
}
**Full Angular Example: that we're properly handling errors globally and reporting them to the user, we should take advantage of the opportunity to track these errors and use them to improve development. Continue reading


Understanding Change Detection Strategies in Angular

InternalViewRef is a subclass of ViewRef:

The ViewRef class embodies a component view in Angular. A Component declared in Angular is represented by a ViewRef class, manipulations in the Component's view is done through its ViewRef class instance. This is what is set to tell Angular that our view has either OnPush or Default CD strategy. We will look at the cases below:

DOM Events cause CD to run on a view with OnPush Strategy. enables the ChecksEnabled flag on components with OnPush CD Strategy an iterates upwards to its parent views enabling any Continue reading


Barrel file benefits in JavaScript – Technbuzz.com

Barrel file is a single place to re export your functions, variables etc for your modules. So now if I want to import a functionality from reducer.ts, I don’t need to specify path as

Because just like index.html file Module Loaders would look for index.ts by default. We are still able to export its functionalities via index.ts

Although its is not directly related to barrel files i-e circular dependency. I have personally experienced the need of renaming a file that was imported in barrel file. Now without Barrel File architecture you need to reflect that name change in every file that use reducers.ts

Thanks to Barrel files, just rename the file in one place i-e index.ts and you are all set. Continue reading


The State of JavaScript Survey 2018 – the Angular Scoop

The overall results for popularity show React, Vue.js, and Angular in the lead, followed by Preact, Ember, and Polymer. I was surprised that Preact made the list of top four, so I checked out exactly what frameworks were in the survey and found this lovely list:

Some of the other top frameworks that didn’t make top 6, included Svelte, Aurelia, Hyperapp, and Backbone. Another unsurprising result is the two leading frameworks for largest company size — Polymer and Angular. I love that good documentation was one of the other top things Angular is liked for. AngularJS is a totally different framework from Angular and I believe its users will have drastically different concerns and happiness levels. Continue reading


New features of PHP 7.3 [Complete guide]

Here is the video

I believe the same is true for PHP,

improvements, even small ones, to language, syntax, and code in general always bring good humour and hope in the fact that during the months,

even years to come,

they can make us better programmers and create applications that make us and our customers happy. This year the team in charge of the updates managed to deliver a few but decisive changes,

Some of the new features had been requested for years,

others are pleasant surprises like those we will receive from our loved ones during the holidays, like those that, on Christmas day were received by the soldiers. Follow the series …

This blog post is the second part of “PHP 7.3 and its Christmas gifts

If you did not read the other parts yet

You can check the other blog posts following the links below

Introduction to PHP 7.3 and new Syntax,

New features of PHP 7.3,

Deprecation and Changes — not published yet, get the ebook if you want to read it now

New Features

JSON_THROW_ON_ERROR

Not having an adequate way to handle errors when using JSON has been a problem for quite a long time, and web developer all over the worlds have seen this as a huge downside of the language,

The RFC of PHP 7.3 has accepted this update by a 23 vs 0 vote which says how much this feature has been requested. For more information about is_countable have a look at the official RFC

array_key_first(), array_key_last()

As per version 5.6 of PHP, there are over 75 built-in functions that belong to the arrays’ category. For instance, the header when using a more loose flag will look like this:

Set-Cookie: key=value; path=/; domain=example.org; HttpOnly; SameSite=Lax

Include features that Increase security in the code seem always a no-brainer but as always before deciding to apply them in our scripts we need to properly evaluate the pro and the cons of our choices

The main risk implied for using the same site flag as a supplementary argument to those functions is that it might never become an official standard. Continue reading

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