I’ll start by stating the obvious: you should first and foremost do the Ruby Small Problems provided by Launch School. Here are some things you can do with metaprogramming in the Ruby language: • Say you want to write a Ruby program that connects to an external system —maybe a web service or a Java program. Look at this: Instead of duplicating these aliases all around, let's provide alias_method_chain(). Spell Book The excerpt from Metaprogramming Ruby. Metaprogramming Ruby. The focus of this book is to demonstrate how metaprogramming happens in Ruby, what its limitations are and what kinds of problems are best solved using it. Learning metaprogramming doesn't have to be difficult or boring. The 5-day Ruby on Rails Programming class led by Sang Shin has been great. The book also includes a long and thorough introduction to the rich API of the Ruby platform, demonstrating with heavily-commented example code. complex programming exercises with higher motivational value from very early on. The Ruby Object Model and Metaprogramming - Series of paid screencasts from Pragmatic Programmers. For example, when a User model is defined in Rails with email as an attribute, a method called find_by_email will be generated. Posts about Development Techologies written by John Ragan. Once you understand the principles of Ruby, including the object model, scopes, and eigenclasses, you're on your way to applying metaprogramming both in your daily work and in your fun, after-hours projects. '}. Programming challenges that let you experiment and play with some of the most out-there metaprogramming concepts. Most makefiles provide a target called clean. The product team has a great new feature they want to add to your Ruby on Rails application: they … Read _why's hacking, Seeing Metaclasses Clearly to learn about the following singleton class (metaclass), Read Marc-Andre Cournoyer's blog, Extending your include knowledge of Ruby to learn about the following methods. Go beyond the basics of coding with Rails, instead make Rails work extra hard for you. ;-), Okay, let's discuss your code in the relevant thread in the Second Week Forum. 2nd, review singleton class. at runtime. Expected output is the following: Look at dog_game.rb. This involves inspecting and modifying a program as it runs using constructs exposed by the language. Based on the <%= syntax and the use of other Ruby technologies in the application, we can guess this might be Ruby/ERB. The course has a good balance of interactive lectures and hands-on exercises. The major language changes in Ruby 2.0 are the addition of keyword arguments and the change to use UTF-8 as the default source file encoding. # metakoans.rb is an arduous set of exercises designed to stretch # meta-programming muscle. Well, let's practice how to write a tiny app with Ruby Metaprogramming techniques. Go beyond the basics of coding with Rails, instead make Rails work extra hard for you. The book is packed with: Pragmatic examples of metaprogramming in action, many of which come straight from real-life gems such as Rails. The course has a good balance of interactive lectures and hands-on exercises… It’s not unusal to hear people complaining about ‘black magic’ in Ruby codebases. I had a chance to look at what Neal Ford had to write on Fluent Interfaces in his book The Productive Programmer.. Granted, I heard him cover it … If you are curious, join the Ruby Metaprogramming course on RubyLearning. As with all our lessons, we believe that the best way to learn is by doing. Useful as a quick reference. It's awesome and fun! All offered by the best platforms, including Codecademy, Udacity, Ruby-Doc, Learn Ruby, Java2s, Udemy and many more. Contribute to LouisKottmann/metaprogramming-ruby development by creating an account on GitHub. Instructions. Collection of Metaprogramming-related small snippets. Ruby Metaprogramming – Complete Course. In Ruby, a class is simply an object like … Each page in the chapter has some introduction, a new concept, an exercise to try out, some more concepts with exercises and wrapping it up by using all the elements learned in that chapter in a slightly challenging exercise. Note: If you have an idea in your mind. You'll learn from real examples that lead to real results. Dig under the surface and explore Ruby's most advanced feature: a collection of techniques and tricks known as metaprogramming. Ruby send method. Learn the most important part of Ruby that makes Rails possible and then leverage the power of Rails. You've learned the basics of writing code with code in Metaprogramming Ruby… Metaprogramming means writing code that writes code. The book covers a lot of core Ruby concepts that are critical to understand metaprogramming: Ruby's object model, method lookup, and module. The book is packed with: Pragmatic examples of metaprogramming in action, many of which come straight from real-life gems such as Rails. Exercise 4: Glance into Ruby inside with binding method. There are three dogs named Lassie, Fido and Stimpy. Practicing with ruby metaprogramming can deepen your understaning of how ruby works 'under the hood', which in turn will help you think through solving 'regular' problems more effectively. Feel free to please show us and try to do that. Class Method to 'Know' Class Name in Ruby? No need to wait for the scheduled class. This gives it more flexibility and is considered one of the most critical aspects to implementing metaprogramming in Ruby. Exercise 2: Add your code to display 'I like metaprogramming!' This fails, obviously, because there’s no method called everything_changes. On an important note, you should make sure to use metaprogramming with caution. :-D. This page was last updated on 20th Dec. 2009. Think of it as a way to “undo” all of the build steps. MetaProgramming - Extending Ruby for Fun and Profit. Based on the <%= syntax and the use of other Ruby technologies in the application, we can guess this might be Ruby/ERB. Preferably, minimal distinction between code and data, Lisp style. Now suppose you want to wrap logging behavior around the above greet(). • Ruby’s object model is the land in which metaprogramming lives. They’re literally made to prepare … Watch the Dave Thomas's presentation about Metaprogramming. Start writing elegant Ruby & Rails code and understanding all the magic behind Ruby on Rails.. Exercise 1: Get the values from outside the class. It's awesome and fun! Just me doing metaprogramming exercises. Look at this simple example from Metaprogramming Ruby. Metaprogramming is supported across many languages using many different techniques; you’ve probably used some of them already. This is fairly unusual for a mainstream object oriented language. We can get the AST of any Elixir code using the quote/2 macro: Exercises ¶ ↑ Metaprogramming … Learn the most important part of Ruby that makes Rails possible and then leverage the power of Rails. If you're not sure about how to split a string, take a look at our lesson on string manipulation in the "Ruby Primer" first. Many ways to manipulate a single object are based on manipulating its single instance class (Singleton Class), and this makes metaprogramming simpler. Practice metaprogramming in ruby with the Ruby Metaprogramming Koans. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Jobs Programming & related technical career opportunities; … You already know you want to learn Ruby, and the smarter way to learn Ruby 2.X is to learn by doing. In this book, you'll learn metaprogramming as an essential component of Ruby and discover the deep, non-obvious details of the language. An entire chapter is devoted to Ruby's metaprogramming capabilities. Advanced Ruby: a 2nd level course. Ruby's String has no method that allows you to split a sentence into an Array of words. :-D. Ruby Metaprogramming Study Note Try to hack the Sample Apps! Practicing with ruby metaprogramming can deepen your understaning of how ruby works 'under the hood', which in turn will help you think through solving 'regular' problems more effectively. The focus of this book is to demonstrate how metaprogramming happens in Ruby, what its limitations are and what kinds of problems are best solved using it. It explains some of the more advanced features of Ruby including blocks and processes, threads, regular expressions, exception handling, singletons, and metaprogramming. Each page in the chapter has some introduction, a new concept, an exercise to try out, some more concepts with exercises and wrapping it up by using all the elements learned in that chapter in a slightly challenging exercise. In ruby … This means it is able to create methods and classes dynamically. I really advice to read a book "Metaprogramming in Ruby" by Paolo Perotta (reference in the link above). Almost every major language construct in Ruby - most notably classes and methods - can be changed at runtime. Exercise 1.02: Assigning a Variable of One Data Type to a Different Type. Once the foundation is laid, basic metaprogramming … Table of contents The alternative is to generate a method definition as a string and execute the string as Ruby code. You will have to make the target phony. A complete Ruby tutorial with exercises and activities that help build key skills Structured to let you progress at your own pace, on your own terms Use your physical copy to redeem free access to the online interactive edition; Book Description. Ruby 2.0 is a minor update to Ruby 1.9, unlike the more major updates from Ruby 1.8 to Ruby 1.9. Ruby supports metaprogramming, which is a technique that helps you to write code that creates code on its own. Ruby caught my attention due to its idiomatic constructs and powerful metaprogramming capabilities. Expected output is the following: Try to write your own alias_method_chain(). Metaprogramming Ruby, Second Edition makes mastering the language enjoyable. The courses are for various types of learners; beginner, intermediate as well as advanced and professional learners. This means it is able to create methods and classes dynamically. There are three dogs named Lassie, Fido and Stimpy. Exercise 1.01: Creating and Assigning Variables. There are several levels – Ruby Primer, Ruby Primer: Ascent, Metaprogramming Ruby and Metaprogramming Ruby: Ascent. This book describes metaprogramming as an essential component of Ruby. Metaprogramming is the act of writing code that operates on code rather than on data. With the help of this course you can Learn metaprogramming! ', :laugh => 'finds this hilarious! Also you can do some Ruby … I am looking for that holy grail book that appeals to experienced programmers AND provides real exercises that would allow me to practice everything i learn. 1. This course was created by Said Abduvaliev. Expected output is the following:. Metaprogramming is code that writes code. Experience dynamic power. Exercises But first let’s finish the homework (day 3 has only a short one). For example, test.new_value = true. I would very much like to evangelize and enfuse in others this passion for ruby. Exercise 1.02: Assigning a Variable of One Data Type to a Different Type. Ruby provides the Module.included method to receive callbacks when this happens. Exercises. The book covers a lot of core Ruby concepts that are critical to understand metaprogramming: Ruby's object model, method lookup, and module. Exercise 3: Show lots of ways to define singleton method. The third element is a list of the arguments. The major language changes in Ruby 2.0 are the addition of keyword arguments and the change to use … Books ¶ ↑ Metaprogramming Ruby - Entire book. Let's discuss all these exercises in the relevant thread in the First Week Forum. This chapter introduces you to the most basic metaprogramming tech-niques. There are several levels – Ruby Primer, Ruby Primer: Ascent, Metaprogramming Ruby and Metaprogramming Ruby… Trying to define a 'class' without using 'class' sentence, class_variables (Try it out: instance_variables), instance_variable_set (Try it out: instance_variable_get), class Dog has three methods: initialize, can, method_missing, may be useful to define the static data like this: I would very much like to evangelize and enfuse in others this passion for ruby. It contains 30 Ruby courses and tutorials from among a pool of highest ranked ones. More than 50 million people use GitHub to discover, fork, and contribute to over 100 million projects. Its creator, Yukihiro “Matz” Matsumoto , blended parts of his favorite languages (Perl, Smalltalk, Eiffel, Ada, and Lisp) to form a new language that balanced functional programming with imperative programming. Tag: ruby. Reas, C. and Fr y, B. Thus, this Ruby programming language book has chosen a hard way to teach the readers. I recently listened to “Uncle ” Bob Martin giving a podcast on Software Craftsmanship on Software Engineering Radio, and decided to pick up his book Clean Code – A Handbook of Agile … Metaprogramming Ruby 2: Program Like the Ruby Pros Paolo Perrotta. Press J to jump to the feed. Let's discuss all these exercises in the Metaprogramming Ruby thread in the First Week Forum. Read the following article: 3rd, review the scope of variables. the focus is on a single method 'attribute' which # behaves much like the built-in 'attr', but whose properties require delving # deep into the depths of meta-ruby… First of all, things like [] (array index) and []= are just methods in Ruby… Please refer our accompanying study notes and examples. This isn’t intended to produce a file called clean, but instead to clean up any files that can be re-built by make. Exercise 1.01: Creating and Assigning Variables. ruby Metaprogramming and keyword self confusing. From here, we edit the input to test to see if we have template injection. You can add methods to classes, remove them or redefine them. The second element is a list of metadata (often line numbers when read from a file). Also read Ruby-Doc Core API: Module#included and Module#extended. You can do all of your metaprogramming with define_method, but the code doesn't look a lot like the code you'd write in normal programming. With metaprogramming, you … Run with ruby … Let’s re-write the program, adding the method to the class by re-opening it. Press question mark to learn the rest of the keyboard shortcuts ... Log in sign up. Drawbacks to Metaprogramming. You can do without editing original code! Programming challenges that let you experiment and play with some of the most out-there metaprogramming … Use a single case class using the Singleton-class. In this vast book, there are a lot of exercises that include setup exercise, comment, and puns, character exercise, … Launch School’s Ruby Small Problems. This allows us to modify the behavior of a program at run time. Exercise … User account menu • Metaprogramming in Ruby - Jonan Scheffler, Director of Developer Relations at New Relic. This is usually because they, or the author of that codebase, or both didn’t understand metaprogramming. From here, we edit the input to test to see if we have template injection. Try to do the following exercises. We'll cover it for completeness, but don't expect to see or use this very often. Look Metaprogramming Ruby this simple example from Metaprogramming Ruby. Instructions. Grab over 4 hours of video teaching the power of Ruby's metaprogramming and watch it whenever you want. Through the years I’ve witnessed many metaprogramming … Metaprogramming is code that writes code. 66.9k members in the ruby community. Read the following article: To learn about the following methods read The Book of Ruby, Chapter 20: Dynamic Programming. I have been auditing the class all week thanks to Sang placing a notice on the SF Ruby meetup list and have learned a … Read the following articles: When does self change? Here’s a brief list of some popular languages besides Ruby that support metaprogramming in some form. Metaprogramming Ruby, Second Edition makes mastering the language enjoyable. Ruby has several metaprogramming facilities. You are describing Ruby. Metaprogramming Ruby Ruby Object Model. One can add create a … Unlike the callbacks associated with methods where the parameter is a Symbol, here we receive the actual object representing the Class/Module. I've been working with ruby for half a decade and am trully in love with how elegant the code is. The Ruby Object Model - Dave Thomas' presentation at Scotland on Rails. 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