Ruby\RoR News Digest 14.09 - 20.09

Learn the tips for the junior developers, Rails 5.2 changes in callbacks and ActionDispatch::Request::Session in Rails 6 
19 September 2019   545

Greetings! I hope your week went great! Here's new Ruby and Ruby on Rails news digest.

In this digest, you will learn how about one of the new Rails 6 feature, read some tips for junior devs, rewinding files before reading and more

Guides

  • More tips and tricks for junior developers

Piece of advice to newbies

  • Rewind Files Before Reading

Guide from the skilled developer

  • Renaming keys in PostgreSQL JSON / Migration template for gem Recorder

Tutorial on a very sophisticated topic, with a big piece of code.

  • Strip Whitespace from Heredocs in Ruby/Rails

Solution on an issue you may face while working with heredoc in Ruby/Rails app

Article

  • Rails 6 adds ActionDispatch::Request::Session#dig

Article about new feature in Rails 6.

  • Rails 5.2 changes in callbacks

Learn about callbacks changes in Rails 5.2.

Updates

  • Passenger 6.0.4 Debian 10 Buster

New version of application server released.

Podcasts

  • MRS 096: Daniel Pritchett

Daniel Pritchett, an infrastructure engineer at Gremlin talks about his Ruby Story with Charles Max Wood, devchat - a podcast website creator.

GraalVM 19.0.3 to be Released

Along with a new update, virtual machine implementations for in JS, Python, Ruby and R received updates too
21 November 2019   61

Oracle has published the release of the universal virtual machine GraalVM 19.3.0, which supports running applications in JavaScript (Node.js), Python, Ruby, R, any languages ​​for JVM (Java, Scala, Clojure, Kotlin) and languages ​​for which the bitcode can be generated LLVM (C, C ++, Rust). Branch 19.3 is classified as long-term support (LTS) and is notable for JDK 11 support, including the ability to compile Java code into executable files (GraalVM Native Image). The project code is distributed under the GPLv2 license. At the same time, new versions of GraalVM-based implementations of the Python, JavaScript, Ruby, and R languages ​​— GraalPython, GraalJS, TruffleRuby, and FastR — have been released.

GraalVM provides a JIT compiler that can execute on-the-fly code of any scripting language in the JVM, including JavaScript, Ruby, Python, and R, and also makes it possible to run native code in the JVM, converted to LLVM bitcode. The tools provided by GraalVM include a language-independent debugger, a profiling system, and a memory allocation analyzer. GraalVM makes it possible to create combined applications with components in different languages, allowing you to access objects and arrays from code in other languages. For languages ​​based on the JVM, it is possible to create executable files compiled into machine code that can be executed directly with minimal memory consumption (memory and thread management are implemented through the connection of the Substrate VM framework).

GraalJS changes (full list):

  • Implemented the Promise.allSettled proposal. It is available in ECMAScript 2020 mode (--js.ecmascript-version=2020).
  • Implemented the nullish coalescing proposal. It is available in ECMAScript 2020 mode (--js.ecmascript-version=2020).
  • Updated ICU4J library to version 64.2.

GraalPython changes (full list):

  • Implement gc.{enable,disable,isenabled} as stubs
  • Implement charmap_build function
  • Implement hexversion in sys module

TruffleRuby changes (full list):

  • Compilation of C extensions is now done with an internal LLVM toolchain producing both native code and bitcode. This means more C extensions should compile out of the box and this should resolve most linker-related issues.
  • It is no longer necessary to install LLVM for installing C extensions on TruffleRuby.
  • It is no longer necessary to install libc++ and libc++abi for installing C++ extensions on TruffleRuby.

 And FastR chages (full list):

  • In this release, FastR does not ship with GCC runtime libraries. Use the following commands to install the necessary dependencies:
  • Preview of support for LLVM based execution of R native extensions
  • Fixed memory leaks reported on GitHub