React Native in a nutshell

Jul 11, 20170 likes738 views

As presented at DevDuck #6 - JavaScript meetup for developers (www.devduck.pl) ---- Looking for a company to build your React app? - Check us out at www.brainhub.eu

REACT NATIVE
in a nutshell
by Szymon Morawski

About React Native
Javascript framework for creating native
applications
released in 2015 by Facebook
open source!
allows to create iOS, Android and UWP applications

So what's the diﬀerence?
no WebView/UIWebView
no hybrid applications
uses native component

Pros:
its React!
smooth interface
most js library works

Cons:
its React...
OS dependent components
no CSS, nor HTML

Learn once, write anywhere
VS
Write once, run anywhere

What do we need?
react-native-cli
Android Studio and Android SDK
or Xcode

Time's up! Let's do this.
https://github.com/smorawski/native-nutshell

Articles worth mentioning:
Comparing the Performance between Native iOS (Swi ) and React-Native
Why You Should Consider React Native For Your Mobile App
React Native documentation
A brief history of React Native
https://medium.com/the-react-native-log/comparing-the-performance-between-native-ios-swi -and-react-
native-7b5490d363e2
https://www.smashingmagazine.com/2016/04/consider-react-native-mobile-app/
https://facebook.github.io/react-native/docs/getting-started.html
https://medium.com/react-native-development/a-brief-history-of-react-native-aae11f4ca39

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RxJS is a library for reactive programming that allows composing asynchronous and event-based programs using observable sequences. It provides the Observable type for pushing multiple values to observers over time asynchronously. Operators allow transforming and combining observables. Key types include Observable, Observer, Subject, BehaviorSubject, and ReplaySubject. Subjects can multicast values to multiple observers. Overall, RxJS is useful for handling asynchronous events as collections in a declarative way.

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TestMigrationsInPy: A Dataset of Test Migrations from Unittest to Pytest (MSR...Andre Hora

Unittest and pytest are the most popular testing frameworks in Python. Overall, pytest provides some advantages, including simpler assertion, reuse of fixtures, and interoperability. Due to such benefits, multiple projects in the Python ecosystem have migrated from unittest to pytest. To facilitate the migration, pytest can also run unittest tests, thus, the migration can happen gradually over time. However, the migration can be timeconsuming and take a long time to conclude. In this context, projects would benefit from automated solutions to support the migration process. In this paper, we propose TestMigrationsInPy, a dataset of test migrations from unittest to pytest. TestMigrationsInPy contains 923 real-world migrations performed by developers. Future research proposing novel solutions to migrate frameworks in Python can rely on TestMigrationsInPy as a ground truth. Moreover, as TestMigrationsInPy includes information about the migration type (e.g., changes in assertions or fixtures), our dataset enables novel solutions to be verified effectively, for instance, from simpler assertion migrations to more complex fixture migrations. TestMigrationsInPy is publicly available at: https://github.com/altinoalvesjunior/TestMigrationsInPy.

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Exceptional Behaviors: How Frequently Are They Tested? (AST 2025)Andre Hora

Exceptions allow developers to handle error cases expected to occur infrequently. Ideally, good test suites should test both normal and exceptional behaviors to catch more bugs and avoid regressions. While current research analyzes exceptions that propagate to tests, it does not explore other exceptions that do not reach the tests. In this paper, we provide an empirical study to explore how frequently exceptional behaviors are tested in real-world systems. We consider both exceptions that propagate to tests and the ones that do not reach the tests. For this purpose, we run an instrumented version of test suites, monitor their execution, and collect information about the exceptions raised at runtime. We analyze the test suites of 25 Python systems, covering 5,372 executed methods, 17.9M calls, and 1.4M raised exceptions. We find that 21.4% of the executed methods do raise exceptions at runtime. In methods that raise exceptions, on the median, 1 in 10 calls exercise exceptional behaviors. Close to 80% of the methods that raise exceptions do so infrequently, but about 20% raise exceptions more frequently. Finally, we provide implications for researchers and practitioners. We suggest developing novel tools to support exercising exceptional behaviors and refactoring expensive try/except blocks. We also call attention to the fact that exception-raising behaviors are not necessarily “abnormal” or rare.

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Migrating from Lotus Notes to Outlook can be a complex and time-consuming task, especially when dealing with large volumes of NSF emails. This presentation provides a complete guide on how to batch export Lotus Notes NSF emails to Outlook PST format quickly and securely. It highlights the challenges of manual methods, the benefits of using an automated tool, and introduces eSoftTools NSF to PST Converter Software — a reliable solution designed to handle bulk email migrations efficiently. Learn about the software’s key features, step-by-step export process, system requirements, and how it ensures 100% data accuracy and folder structure preservation during migration. Make your email transition smoother, safer, and faster with the right approach. Read More:- https://www.esofttools.com/nsf-to-pst-converter.html

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If we were building a GenAI stack today, we'd start with one question: Can your retrieval system handle multi-hop logic? Trick question, b/c most can’t. They treat retrieval as nearest-neighbor search. Today, we discussed scaling #GraphRAG at AWS DevOps Day, and the takeaway is clear: VectorRAG is naive, lacks domain awareness, and can’t handle full dataset retrieval. GraphRAG builds a knowledge graph from source documents, allowing for a deeper understanding of the data + higher accuracy.

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Software testing plays a crucial role in the contribution process of open-source projects. For example, contributions introducing new features are expected to include tests, and contributions with tests are more likely to be accepted. Although most real-world projects require contributors to write tests, the specific testing practices communicated to contributors remain unclear. In this paper, we present an empirical study to understand better how software testing is approached in contribution guidelines. We analyze the guidelines of 200 Python and JavaScript open-source software projects. We find that 78% of the projects include some form of test documentation for contributors. Test documentation is located in multiple sources, including CONTRIBUTING files (58%), external documentation (24%), and README files (8%). Furthermore, test documentation commonly explains how to run tests (83.5%), but less often provides guidance on how to write tests (37%). It frequently covers unit tests (71%), but rarely addresses integration (20.5%) and end-to-end tests (15.5%). Other key testing aspects are also less frequently discussed: test coverage (25.5%) and mocking (9.5%). We conclude by discussing implications and future research.

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React Native in a nutshell

1. REACT NATIVE in a nutshell by Szymon Morawski

2. About React Native Javascript framework for creating native applications released in 2015 by Facebook open source! allows to create iOS, Android and UWP applications

3. I've heard that somewhere...

4. Ahhh, Apache Cordova!

5. So what's the diﬀerence? no WebView/UIWebView no hybrid applications uses native component

6. Pros: its React! smooth interface most js library works

7. Cons: its React... OS dependent components no CSS, nor HTML

8. Learn once, write anywhere VS Write once, run anywhere

9. What do we need? react-native-cli Android Studio and Android SDK or Xcode

10. Time's up! Let's do this. https://github.com/smorawski/native-nutshell

11. Articles worth mentioning: Comparing the Performance between Native iOS (Swi ) and React-Native Why You Should Consider React Native For Your Mobile App React Native documentation A brief history of React Native https://medium.com/the-react-native-log/comparing-the-performance-between-native-ios-swi -and-react- native-7b5490d363e2 https://www.smashingmagazine.com/2016/04/consider-react-native-mobile-app/ https://facebook.github.io/react-native/docs/getting-started.html https://medium.com/react-native-development/a-brief-history-of-react-native-aae11f4ca39

12. Thank You!

React Native in a nutshell

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