REFLEXIVE METAPROGRAMMING IN RUBY TUTORIAL PRESENTATION H. Conrad Cunningham Department of Computer and Information Science University of Mississippi University, MS 38677 (662) 915-5358 firstname.lastname@example.org ABSTRACT Ruby is an interpreted, dynamically typed, object-oriented application programming language . In a nutshell, using metaprogramming you can reopen and modify classes, catch methods that donât exist and create them on the fly, create code that is DRYby avoiding repetitions, and more. Home Collections Hosted Content Journal of Computing Sciences in Colleges Vol. Once you understand the principles of Ruby, including the object model, scopes, and eigenclasses, you're on … Metaprogramming in Ruby The Weekly Iteration 11 minutes Video. Name change — Spiced Ruby. Request PDF | Reflexive metaprogramming in Ruby: tutorial presentation | Ruby is an interpreted, dynamically typed, object-oriented application programming language . This technique, called metaprogramming, is popular with code framework developers.This is how you get code generation and smart features in many popular frameworks and libraries like Ruby On Rails or TensorFlow. Crazy, right? beginner Ruby Primer. Free, interactive tutorials to help you discover Ruby idioms, in your browser! Ruby is one of the best languages for Metaprogramming, and Rails uses this capability well. Twitter @ElijahNomad Hey. Closed. article . By cleverly planning your code and applying the techniques mentioned here, you’ll be able to write code that is DRYer, lighter, more intuitive and more scalable. Rails also uses code generation but relies much more on Metaprogramming for the heavy lifting. This means that programmers should not repeat the same code . Here we meet one of the main tools in the metaprogramming toolkit - missing methods. C# Tutorials. Ruby metaprogramming online-tutorial [closed] Ich habe gerade begonnen, Ruby zu lernen und habe die Grundlagen gut verstanden. If you are interested in exploiting the true power of Ruby, then the articles on this page are for you. tutorial - ruby metaprogramming . If you are interested in exploiting the true power of Ruby, then the articles on this page are for you. Start here. Last Updated: October 07, 2017. Metaprogramming. time. For example, metaprogramming like this makes searching for method definitions With metaprogramming we have gotten rid of code duplication and hard coding, freeing up headspace for actual business logic. It is implemented as an internal (or embedded) DSL [4, 5] using Ruby's flexible syntax and extensive reflexive metaprogramming facilities . Ruby is a prime language for dynamic metaprogramming because it employs type introspection and is intensely reflective â to a higher degree than just about any other language out there. I have just started to learn Ruby and got a good take on the basics. Metaprogramming in ruby refers to code that writes code for you dynamically. The Ruby API covers all the methods Iâve talked about here plus more. Monkey Patching "with great power comes great responsibility" Module. You want to learn Ruby for fun, for a new job, or just to see what all the fuss is about? Image credit: dave thomas's video tutorials on metaprogramming from pragmatic Open Classes . Ruby, Writing a Domain-Specific Language in Ruby. Ruby on Rails is essentially a domain-specific language (DSL) [1, 6] for web applications. Metaprogramming Ruby focuses on explaining the Ruby object model and how core Ruby is constructed in order to enable you as a Ruby programmer to unlock functionality that isnât immediately obvious. For an upcoming post, I needed to get my hands on Ruby’s metaprogramming capabilities. eval is a method on the Kernel module, which is included in the Object class, hence, available on all Ruby objects. If there is a less-complicated solution to a problem, reach for that first. Start Course. Meta Singleton Ghost Eigen Ghost Class. This tutorial does not concern itself with Ruby on Rails, but, instead, focuses on the Ruby features that make Rails possible. Just like many other ruby developers, I wanted to learn metaprogramming to make the leap from Ruby novice to Ruby pro. Ruby DSL(Domain Specific Language) repositories, examples (4) Another example, of course, is Rake, the Ruby build system. Tuesday is all about methods - how Ruby works out which method to call and in what context. This article is written by an author from toptal.com ( Origin) Domain specific languages (DSL) are an incredibly powerful tool for making it easier to program or configure complex systems. Metaprogrammering kan op twee manieren worden beschreven: âComputerprogramma's die andere programma's (of zichzelf) als hun gegevens schrijven of manipuleren, of die tijdens het compileren een deel van het werk doen dat anders tijdens runtime zou worden gedaanâ. This tutorial is created by the official development team of Ruby. Java Tutorials Java Programs Java Questions and Answers. The Ruby Language FAQ; Trying to define a 'class' without using 'class' sentence; Ruby Mixin Tutorial; Evaluation Options in Ruby; Recommended Book. What makes a DSL "good" in my opinion: Notation conforms to meaning, i.e. Flexibility : Methods can be added to existing classes without sub classing, operators can be overloaded, and even the behaviour of the standard library can be redefined at runtime. Poorly-written DSLs are a bad abstraction. Domain-Specific Language in Ruby. Learn Ruby. Since we spend so much more time reading code than writing it, code Prototype Inheritance Mixin Modules mix(ed) in. 22. It's a hard line to walk, but a good DSL can save a tremendous amount of time. Ich höre immer wieder, dass eines der coolen Dinge, die Ruby sehr gut macht, Metaprogrammierung ist, aber keine der tutorials, die ich gelesen habe, decken dies ab. expressive, declarative code: Well-written DSLs cover implementation details that don't matter (like This tutorial does not concern itself with Ruby on Rails, but, instead, focuses on the Ruby features that make Rails possible. Ruby Metaprogramming: Part I. Creating a Ruby DSL: A Metaprogramming Tutorial Unknown. Ruby has saner tools (#define_method, #send) in its meta-programming repertoire that you can use to achieve eval-like cleverness. 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