You will learn and implement a microservice in COBOL without Mainframe. You will structure the project, manage dependencies, implement automatic tests and build virtualized execution environment. Finally, you will publish the microservice on GitHub under Continuous Integration workflow.
PVS-Studio: analyzing pull requests in Azure DevOps using self-hosted agents
12 min
Static code analysis is most effective when changing a project, as errors are always more difficult to fix in the future than at an early stage. We continue expanding the options for using PVS-Studio in continuous development systems. This time, we'll show you how to configure pull request analysis using self-hosted agents in Microsoft Azure DevOps, using the example of the Minetest game.
Top 10 Kotlin App Development Companies 2020-21
10 min
Kotlin is a JVM compatible & Java interoperable language that is the most-encouraged language by Google for developing Android apps & production-grade systems. According to Snyk, over the last few years, Kotlin has gained a huge user and developer base for robust, and secure app development.
The user-base has been shifted from 2.4% to 5.4%, that is a growth of 130% in the user population. This population growth and increment in its usage has made it the second most popular JVM language, that is quite surprising.
The reason for Kotlin application development is its 100% interoperability with Java. Around 7.78% of the world developers use Kotlin as their primary coding language. According to insights.dice- Kotlin is used 96% for new projects and 36% for migrating applications from Java to Kotlin. You can use it directly with Java code to make it more efficient, and it works concurrently or without any issue.
Many benchmark android applications of startups to moonshots have been built using Kotlin. Various startups and brands like EverNote, Twitter, Netflix, Slack, American Express, Airbnb, Adobe, and many others from different industry verticals opted for Kotlin app development.
Analysis of merge requests in GitLab using PVS-Studio for C#
8 min
Do you like GitLab and don't like bugs? Do you want to improve the quality of your source code? Then you've come to the right place. Today we will tell you how to configure the PVS-Studio C# analyzer for checking merge requests. Enjoy the reading and have a nice unicorn mood.
IntelliJ IDEA: Structural Search and Replace
11 min
Tutorial
Translation
Modern IDEs are very powerful tools that can help developers in all kinds of situations. Unfortunately, much of this power is often lost because many functions remain unknown to developers, hiding in the shadows.
Simple example of the one of the such functions
Did you know that when you press F2 in IntelliJ IDEA, the cursor will jump to the nearest error in the file? And in the absence of an error – to the nearest warning? It seems that this is a secret only a few people know about.
Structural search and replace is one such pair of features. They can be extremely useful in situations where a whole variety of other functions can’t quite get the job done.
In this post, I will present some of these situations and go beyond artificial cases by demonstrating examples of real code from two projects:
- 3D-engine for game development, jMonkeyEngine, which is an example of a big, interesting project.
- My own pet project, plantuml-native-image, where I experiment with compiling PlantUML into native executable code using GraalVM Native Image.
In fact, it is this second project that encouraged me to write this post but I’m getting ahead of myself. First things first...
Small things that pollute your code
4 min
I'm not going to discuss global things like design patterns and so on, as there's enough literature on that topic. Instead, I'd like to attract your attention to some small things that still affect lucidity and maintainability of a code.
First of all, if you give access to something that shouldn't be used in production code, it gets used sooner or later. Just because it exist. The argument that it's an internal stuff doesn't work as it absolutely shouldn't be matter, writing you a library or isolated project! Treat people who will add anything to your internal codebase the same way as if they use your existing code as a different library.
Thus, if for some reason in test, you need to call something that should not be called on prod — use reflection or whatever else but do not expose it in production code! And there's no reason to afraid of reflection for test proposes, at the end, you using Mockito, shouldn't it be bad in that case as well?
Polluting code with 'test-only' methods or access modifiers
First of all, if you give access to something that shouldn't be used in production code, it gets used sooner or later. Just because it exist. The argument that it's an internal stuff doesn't work as it absolutely shouldn't be matter, writing you a library or isolated project! Treat people who will add anything to your internal codebase the same way as if they use your existing code as a different library.
Thus, if for some reason in test, you need to call something that should not be called on prod — use reflection or whatever else but do not expose it in production code! And there's no reason to afraid of reflection for test proposes, at the end, you using Mockito, shouldn't it be bad in that case as well?
Angular vs React vs Vue 2020
4 min
There are various programming languages available but it is difficult to choose the best one when it comes to our own project. And sometimes we even get stuck between the different languages when we have to make a choice among them.
Hire PHP Developers: Cost & Procedure
5 min
PHP has surely become the most ubiquitous language for the world today. Being around for a while, PHP is ruling the market, with expectations to dominate for years to come. Therefore, irrespective of the size of a business, PHP remains the first choice to get a sturdy and customizable website created.
However, It is important to understand that PHP is an art (Scripting language), you need to hire an artist (developer) to yield the best from it.
Choosing the best from the pool of more than 5 million PHP developers is a tedious task. Even more when you’re a noob into this industry. Apart from language skills, there are multiple other factors, such as budget, skills, experience that influence the decision to hire a particular remote PHP team.
PVS-Studio and Continuous Integration: TeamCity. Analysis of the Open RollerCoaster Tycoon 2 project
8 min
One of the most relevant scenarios for using the PVS-Studio analyzer is its integration into CI systems. Even though a project analysis by PVS-Studio can already be embedded with just a few commands into almost any continuous integration system, we continue to make this process even more convenient. PVS-Studio now supports converting the analyzer output to the TeamCity format-TeamCity Inspections Type. Let's see how it works.
Free CRM with PBX
3 min
Why do you need a CRM system? Well, it’s at least more convenient than keeping your client database in Excel. Why do you need CRM with VoIP? If you have ever interacted offline, you know you cannot do it without telephony (orders, delivery, support etc.).
But what prevents 80% of companies from trying out a CRM tool? If prices is the matter, we are offering a free CRM system integrated with the phone system and free PBX.
To anticipate questions about installation difficulty, CRM setup and contact import doesn’t take more than 5 minutes.
But what prevents 80% of companies from trying out a CRM tool? If prices is the matter, we are offering a free CRM system integrated with the phone system and free PBX.
To anticipate questions about installation difficulty, CRM setup and contact import doesn’t take more than 5 minutes.
Beyond the “contact tracing” app
5 min
As a mathematician, it amazes me how much computing power fits on our mobile phones today. Like other «Gen Z» digital natives, I grew up watching people dream up and build technologies that have transformed our social lives, work lives and everything in between.
Yet in a time when humanity desperately needs innovation more than ever, the application of mobile technologies in the fight against COVID-19 has been weak and fragmented. We have technology literally at our fingertips that could be utilized to help us through this pandemic, but governments around the world have barely managed to develop even a contact tracing app.
Yet in a time when humanity desperately needs innovation more than ever, the application of mobile technologies in the fight against COVID-19 has been weak and fragmented. We have technology literally at our fingertips that could be utilized to help us through this pandemic, but governments around the world have barely managed to develop even a contact tracing app.
Objects Representations for Machine Learning system based on Lattice Theory
5 min
This is a fourth article in the series of works (see also first one, second one, and third one) describing Machine Learning system based on Lattice Theory named 'VKF-system'. The program uses Markov chain algorithms to generate causes of the target property through computing random subset of similarities between some subsets of training objects. This article describes bitset representations of objects to compute these similarities as bit-wise multiplications of corresponding encodings. Objects with discrete attributes require some technique from Formal Concept Analysis. The case of objects with continuous attributes asks for logistic regression, entropy-based separation of their ranges into subintervals, and a presentation corresponding to the convex envelope for subintervals those similarity is computed.
The Code of the Command & Conquer Game: Bugs from the 90's. Volume two
13 min
The American company Electronic Arts Inc (EA) has opened the source code of the games Command & Conquer: Tiberian Dawn and Command & Conquer: Red Alert publicly available. Several dozen errors were detected in the source code using the PVS-Studio analyzer, so, please, welcome the continuation of found defects review.
Mathematics of Machine Learning based on Lattice Theory
7 min
This is a third article in the series of works (see also first one and second one) describing Machine Learning system based on Lattice Theory named 'VKF-system'. It uses structural (lattice theoretic) approach to representing training objects and their fragments considered to be causes of the target property. The system computes these fragments as similarities between some subsets of training objects. There exists the algebraic theory for such representations, called Formal Concept Analysis (FCA). However the system uses randomized algorithms to remove drawbacks of the unrestricted approach. The details follow…
Production-ready chatbot in GCP for less than a dollar
4 min
Tutorial
We have all been there — having a nice idea for a hackathon, hobby or a side project and having a burning desire to start coding as soon as possible. And how many possibilities (Heroku, Glitch and others) are there now to bootstrap your app and deploy it immediately.
Machine Learning CPython library 'VKF'
14 min
Previous article describes a web server for Machine Learning system 'VKF' based on Lattice Theory. This paper is an attempt to explain details of using the CPython library directly. We reproduce working sessions of experiments on datasets 'Mushroom' and 'Wine Quality' from UCI Machine Learning repository. The structures of input files are discussed too.
Yii news 2020, issue 5
4 min
Hello, community!
It is time for another Yii news issue. Both Yii 2 and Yii 3 are doing well.
I've finally updated the team page on the website to reflect the current state of things.
Konstantin Sirotkin is back and actively taking care of ElasticSearch Yii 2 extension.
Yii 3 main team was formed (actually happened late 2019). Likely you know the names because most were mentioned in previous Yii news issues.
Also, we have partially moved to GitHub actions. Experience is great so far, so we can definitely recommend that. We're adding phan static analysis
and running tests with Infection to make code quality even better.
10 Best Email Scraping Tools for Sales Prospecting in 2020
3 min
We all know how hard it is to build an email sales list from scratch, especially for small companies. There left no options due to limited resources. In fact, many companies even buy preset profiled lists from the third party and send identical mass emails. It can put your business in a vulnerable position ascribed into the low quality of the email lists. However, there is a better way to build a highly targeted email list with email scraping tools.
Email scraping can help you collect email addresses shown publicly using a bot. What makes this great is that you have control over where to get the email lists from, and who can opt-in. Moreover, you don’t have to rely on the second-hand source. I profiled a list of best 10 email scraping tools for sales prospecting. Let’s take a look.
1. Zoominfo
A full-featured email scraping platform with a comprehensive database. You can directly search for titles and companies within their platform. It is more like a directory system that covers professionals in all industries with contact information. Email lists are the assets. That said, it comes with a price tag. It is worth to invest if you are looking for accurate sales leads. Zoominfo is an excellent option for enterprise-level sales prospects.
Email scraping can help you collect email addresses shown publicly using a bot. What makes this great is that you have control over where to get the email lists from, and who can opt-in. Moreover, you don’t have to rely on the second-hand source. I profiled a list of best 10 email scraping tools for sales prospecting. Let’s take a look.
1. Zoominfo
A full-featured email scraping platform with a comprehensive database. You can directly search for titles and companies within their platform. It is more like a directory system that covers professionals in all industries with contact information. Email lists are the assets. That said, it comes with a price tag. It is worth to invest if you are looking for accurate sales leads. Zoominfo is an excellent option for enterprise-level sales prospects.
How to find an English teacher. Part 2
4 min
This is a continuation of story about using Data Science for finding an English teacher. If you have not read it yet - there is an opportunity to become familiar with it
Briefly - we had information about language teachers and tried to apply some basic ideas using pandas and our expectations. Unfortunately we got stuck on the third step, because there is not enough information for resolving our the last requirements - we need not more 3 candidates at the end.
Disclaimer
It is an approach based on my own experience and can be unsuitable to your point of view, ideas, or principles.
PVS-Studio is now in Compiler Explorer
4 min
Not so long ago, a landmark event has happened: PVS-Studio appeared in Compiler Explorer! Now you can quickly and easily analyze the code for errors right on the godbolt.org site (Compiler Explorer). This feature opens up a large number of new possibilities – from quenching curiosity about the analyzer's abilities to being able to quickly share check results with a friend. This article will cover the topic on how to use these features. Caution – large GIFs!
Hubs
Authors' contribution
alizar 94192.8marks 24166.6ru_vds 22814.1alexzfort 14179.0XaocCPS 10986.2ptsecurity 10881.7pronskiy 10649.4m1rko 10382.0Andrey2008 9907.2ph_piter 9861.3