Time-Saving Chrome DevTools Shortcuts

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It is impossible to imagine modern web development without the use of Chrome DevTools. Thanks to a clean UI and continuous improvements to meet real-world needs, the tool has become the go-to live development environment that surpasses many contemporary IDEs in both functionality and performance.

But how productive are you with the DevTools in your daily development workflow? I’d like to share some of my favorite shortcuts that will help you master the tool.

Web Dev Roundup: What the CRUD!

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Greetings and thanks for tuning in for this month’s roundup! Last time, we discussed the Django framework for Python-based web application development. In this month’s post, we look at how the DZone community is using the create, read, update, and delete (CRUD) operations of a relational database in their web applications. Keep scrolling for some great articles by DZone contributors, and some cruddy puns by yours-truly. 

And, as a quick side note, if you’re interested in writing for DZone, but don’t have a topic in mind, come check out our Bounty Board, where you can win prizes for providing great content, and our Writer’s Zone which has plenty of prompts, tips, and tricks! 

Dynamic Class Instantiation and NS in PHP

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The first step in developing every program’s business, right after designing and defining the required classes, is class instantiation. And it is a very straightforward process. You call the class constructor which is exactly the same as the class name, followed by the respective namespace, pass the required arguments (if any), and that’s it.

The scenario described above is exactly what happens in nearly all situations. But there is a condition where exceptions may arise: whenever you try to instantiate a class dynamically.

Python Frameworks Used for Application-Oriented Fields

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Python is an open-source object-oriented programming language. Python is one of the most popular programming languages in the world. It has a well-organized source code, and it is used for web applications and numerous other things.

Python is also easy to interface with frameworks. There are several frameworks that allow for easier customization and less coding. They help developers get the job done faster. With these frameworks, games, apps, educational programs, and other software can be built faster and better.

An Angular Autocomplete From UI to DB

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The MovieManager project is used to manage my collection of movies and uses Angular and Spring Boot with PostgreSQL to do it.

The project is used to show how to build the autocomplete search box for the movie titles. The autocomplete box uses Bootstrap 4 for styling and Angular on the front-end and Spring Boot with PostgreSQL on the backend. The focus is on how to use native Angular/RxJS together with Spring Boot and a relational database.

ASP.NET Core: CRUD With React.js and Entity Framework Core

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In this article, we are going to create a web application using ASP.NET Core 2.0 and React.js with the help of the Entity Framework Core database first approach. We will be creating a sample Employee Record Management system and performing CRUD operations on it. To read the inputs from the user, we are using HTML Form elements with required field validations on the client side. We are also going to bind a dropdown list in the HTML Form to a table in the database using EF Core.

We will be using Visual Studio 2017 and SQL Server 2014.

Powering Your App With a Real-Time Messaging CDN

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CDN — Content Delivery Network

Let’s start with defining a CDN. A content delivery network (CDN) is a system of distributed servers that traditionally delivers web content to a user, based on the geographic locations of the user, the origin of the webpage and the content delivery server. I use the term traditionally because we’re entering an era where CDNs are doing more than just delivering web content.

An example would be Cloudflare Workers, which lets you use their CDN to run code at the edge, rather than just serve web pages/cached content. You are basically able to deploy and run JavaScript away from the origin server — allowing you to decouple code from a user’s device. According to Cloudflare, “these Workers also enable programmatic functionality for routing, filtering and responding to HTTP requests that would otherwise need to be run on a customer’s server at the origin.”

Top 10 Errors From 1000+ Ruby on Rails Projects (and How to Avoid Them)

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To give back to the developer community, at Rollbar we looked at our database of thousands of projects and found the top 10 errors in Ruby on Rails projects. We’re going to show you what causes them and how to prevent them from happening. If you avoid these "gotchas," it’ll make you a better developer.

Because data is king, we collected, analyzed, and ranked the top 10 Ruby errors from Ruby on Rails applications. Rollbar collects all the errors for each project and summarizes how many times each one occurred. We do this by grouping errors according to fingerprinting. Basically, we group two errors if the second one is just a repeat of the first. This gives users a nice overview instead of an overwhelmingly big dump like you’d see in a log file.

Validation Using Template-Driven Forms in Angular 5

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Introduction

In this post, we are going to see how to perform validation using template-driven forms in Angular 5; this is just a different approach that you can follow, as we have discussed another way in our previous post. At the end of this article, you will get to know how you can implement validations in Angular 5 application using Template-Driven Forms. This post is a continuation of the Developing an Angular 5 App series; if you haven’t gone through the previous posts yet, I strongly recommend you to do that. You can find the links to the previous posts below. I hope you will like this article.

Developing an Angular 5 App Series

These are the previous posts in this series. Please go ahead and have a look.

The Big Bang of Web Development: Get Moving With JavaScript

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We’re back this week to explore the fundamental elements of web development before we move into more complex topics. This weeks focus is JavaScript. If you haven’t checked out my previous blogs for the trifecta of web development, check out my blog posts on HTML and CSS.

JavaScript: a once feared technology is now (and has been for a while) a de-facto choice for development. It allows you to program dynamic behavior on your web page.

Code Quality Matters in Rails

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Alarmingly, 23% of participants in our 2018 Ruby on Rails survey reported not using any of the tools to check code quality.

Thankfully, 67% use Rubocop. Rubocop is a real gem (pun intended). It’s more than a style guide check. It also ensures all developers working on a project use the same set of guidelines for metrics like assignment branch condition (ABC) size to prohibit methods from getting too complex. Running Rubocop on a feature branch before submitting a PR is a great asset for new team members who are becoming acclimated to your team’s conventions.

Functional Programming With JavaScript Object Arrays

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We look at using map, filter, and reduce to manipulate arrays of objects, using techniques borrowed from functional programming.

Data manipulation is a common task in any JavaScript application. Fortunately, new array handling operators map, filter, and reduce are widely supported. While the documentation for these features is sufficient, it often shows very basic use cases for implementation. In daily use, we often need to use these methods to deal with arrays of data objects, which is the scenario lacking from the documentation. In addition, these operators are often seen in functional languages and bring to JavaScript a new perspective on iterating through objects with a functional touch.

Bootstrap and its Features

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Bootstrap was introduced for the first time on August 19, 2011. Bootstrap is a front-end focused, free to use and share library which is used for designing websites and applications. Websites and applications that can be designed using Bootstrap are compatible with both iOS and Android.

BootStrap Design Templates

Bootstrap contains a variety of design templates. These design templates are based on and work with the following:

The Future of Native Modules in Node.js

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Node.js 10 is just around the corner and with it comes a number of improvements. One that is exciting us is the update to the native module library n-api. It comes out of experimental status in the upcoming release.

JavaScript has always had a minimal standard library compared to other languages. In the beginning, we only used JavaScript in the browser. As browsers evolved and matured into application virtual machines, so did the need to add more capability through browser libraries. This brought new applications like Web Bluetooth, Web USB and so on; ever expanding the things we can use JavaScript for.

The State of Test Coverage in Rails

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One of the things that we look for when examining the health of a Rails application is the percentage of test coverage the app has, using a tool like simplecov. This should only test the code your team has written and not 3rd party libraries (one reason why it’s important to keep your 3rd party dependencies separate from the rest of your code).

In the Rails Survey this year, we asked a new question about how many existing Rails applications the respondents work on have decent test coverage (above 80%).

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