It's awesome and fun! The second element is a list of metadata (often line numbers when read from a file). From here, we edit the input to test to see if we have template injection. Let's start learning Ruby Metaprogramming! Implement a clean target for the paper.pdf Makefile above. Note: If you have an idea in your mind. Exercise 3: Show lots of ways to define singleton method. Now suppose you want to wrap logging behavior around the above greet(). Exercise 1.01: Creating and Assigning Variables. ... Perrotta, P. (20 10) Metaprogramming Ruby. Feel free to please show us and try to do that. Metaprogramming Ruby 2: Program Like the Ruby Pros Paolo Perrotta. Programming challenges that let you experiment and play with some of the most out-there metaprogramming … Metaprogramming is writing programs that write programs. Metaprogramming. 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. Metaprogramming Ruby Ruby Object Model. Press question mark to learn the rest of the keyboard shortcuts ... Log in sign up. Metaprogramming / send method / Essential Ruby, Ruby latest stable (v2_5_5) - 1 note - Class: Object send(*args) public You can use __send__ if the name send clashes with an existing method in obj. Grab over 4 hours of video teaching the power of Ruby's metaprogramming and watch it whenever you want. Read the following articles: When does self change? Ruby's facilities for text processing, numeric manipulation, collections, input/output, networking, and concurrency. Details are here. 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 and in Rails. There are three dogs named Lassie, Fido and Stimpy. Look at this: Instead of duplicating these aliases all around, let's provide alias_method_chain(). 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. Ability to create classes, methods, functions, etc. You can add methods to classes, remove them or redefine them. See you! A quick look at ERB documentation tells us that the <%= syntax executes a Ruby … Thus, this Ruby programming language book has chosen a hard way to teach the readers. ', :laugh => 'finds this hilarious! Tag: ruby. Code that writes code. 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. In this vast book, there are a lot of exercises that include setup exercise, comment, and puns, character exercise, … It’s not unusal to hear people complaining about ‘black magic’ in Ruby codebases. Level up your Ruby skills on your own schedule. An entire chapter is devoted to Ruby's metaprogramming capabilities. 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. There are several levels – Ruby Primer, Ruby Primer: Ascent, Metaprogramming Ruby and Metaprogramming Ruby: Ascent. ;-), Okay, let's discuss your code in the relevant thread in the Second Week Forum. Through the years I’ve witnessed many metaprogramming … Ruby Metaprogramming – Complete Course. Let's add a method called words to String to do just this. Could you please complete it? Exercise 1.02: Assigning a Variable of One Data Type to a Different Type. There are several levels – Ruby Primer, Ruby Primer: Ascent, Metaprogramming Ruby and Metaprogramming Ruby… Try to do the following exercises. This means it is able to create methods and classes dynamically. Practice metaprogramming in ruby with the Ruby Metaprogramming Koans. Ruby supports metaprogramming, which is a technique that helps you to write code that creates code on its own. Exercise 1: Get the values from outside the class. The product team has a great new feature they want to add to your Ruby on Rails application: they … Many ways to manipulate a single object are based on manipulating its single instance class (Singleton Class), and this makes metaprogramming simpler. The book covers a lot of core Ruby concepts that are critical to understand metaprogramming: Ruby's object model, method lookup, and module. Chapter 2, Monday: The Object Model, on page ?, provides a map to this land. Launch School’s Ruby Small Problems. Interactive Ruby Shell. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Jobs Programming & related technical career opportunities; … 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. • Ruby’s object model is the land in which metaprogramming lives. Look Metaprogramming Ruby this simple example from Metaprogramming Ruby. Ruby send method. There are a number of additions to the standard library, including: You can't set an instance variable with @foo=4; you have to call instance_variable_set('foo', 4). One can add create a … There are several levels – Ruby Primer, Ruby Primer: Ascent, Metaprogramming Ruby and Metaprogramming Ruby… I'm starting to learn metaprogramming in Ruby and (I think) I'm understanding how to add instance methods and variables, but only if passed in one at a time. 2nd, review singleton class. They’re literally made to prepare … If you’ve done Ruby programming before, this course will help take your coding to the next level. Learn how to build your practical Ruby skills so that you can kick-start your career as a developer and rapidly prototype high-performing web applications. We can get the AST of any Elixir code using the quote/2 macro: Metaprogramming is supported across many languages using many different techniques; you’ve probably used some of them already. I wrote the following code. Exercise … Watch the following presentation, the Scotland on Rails conference 2009, by Dave Thomas. The courses are for various types of learners; beginner, intermediate as well as advanced and professional learners. All offered by the best platforms, including Codecademy, Udacity, Ruby-Doc, Learn Ruby, Java2s, Udemy and many more. Just me doing metaprogramming exercises. Well, let's practice how to write a tiny app with Ruby Metaprogramming techniques. This is fairly unusual for a mainstream object oriented language. This course was created by Said Abduvaliev. 66.9k members in the ruby community. Also you can do some Ruby … 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 … Practice metaprogramming in ruby with the Ruby Metaprogramming … Once the foundation is laid, basic metaprogramming … 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 … Whether you're a Ruby apprentice on the path to mastering the language or a Ruby wiz in search of new tips, this book is for you. Dig under the surface and explore Ruby's most advanced feature: a collection of techniques and tricks known as metaprogramming. Spell Book The excerpt from Metaprogramming Ruby. This fails, obviously, because there’s no method called everything_changes. This involves inspecting and modifying a program as it runs using constructs exposed by the language. These may be useful for programmers who have turned to Ruby from other languages or have not yet experienced the joys of Ruby metaprogramming. Ruby supports metaprogramming, which is a technique that helps you to write code that creates code on its own. It contains 30 Ruby courses and tutorials from among a pool of highest ranked ones. MSGS = {:dance => 'is dancing', :poo => 'is a smelly doggy! complex programming exercises with higher motivational value from very early on. This gives it more flexibility and is considered one of the most critical aspects to implementing metaprogramming in Ruby. I’ll start by stating the obvious: you should first and foremost do the Ruby Small Problems provided by Launch School. Metaprogramming Ruby, Second Edition makes mastering the language enjoyable. Also read Ruby-Doc Core API: Module#included and Module#extended. Learning metaprogramming doesn't have to be difficult or boring. 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. For example, when a User model is defined in Rails with email as an attribute, a method called find_by_email will be generated. Books ¶ ↑ Metaprogramming Ruby - Entire book. at runtime. Metaprogramming Ruby, Second Edition makes mastering the language enjoyable. I'm In 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. I'd like to add the count feature without editing the original file. Expected output is the following: Look at dog_game.rb. Exercise 2: Add your code to display 'I like metaprogramming!' This last is pretty important, because metaprogramming is arguably one of the most misused features of the Ruby language. The major language changes in Ruby 2.0 are the addition of keyword arguments and the change to use … Metaprogramming means writing code that writes code. For free! 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. The book covers a lot of core Ruby concepts that are critical to understand metaprogramming: Ruby's object model, method lookup, and module. 1st, review the built-in, read-only variable self. Table of contents Experience dynamic power. No need to wait for the scheduled class. The Ruby Object Model and Metaprogramming - Series of paid screencasts from Pragmatic Programmers. Exercises But first let’s finish the homework (day 3 has only a short one). Get all the sample code and exercises and a copy of Ruby DSL Handbook in ePub, PDF, and mobi. Ruby and in Rails. This book describes metaprogramming as an essential component of Ruby. Advanced Ruby: a 2nd level course. Instructions. This allows us to modify the behavior of a program at run time. Ruby's String has no method that allows you to split a sentence into an Array of words. This means it is able to create methods and classes dynamically. MetaProgramming - Extending Ruby for Fun and Profit. Pragmatic Programmers. Collection of Metaprogramming-related small snippets. This isn’t intended to produce a file called clean, but instead to clean up any files that can be re-built by make. :-D. Ruby Metaprogramming Study Note Try to hack the Sample Apps! Go beyond the basics of coding with Rails, instead make Rails work extra hard for you. It explains some of the more advanced features of Ruby including blocks and processes, threads, regular expressions, exception handling, singletons, and metaprogramming. Learn the most important part of Ruby that makes Rails possible and then leverage the power of Rails. Most makefiles provide a target called clean. Metaprogramming. :-D. This page was last updated on 20th Dec. 2009. With the help of this course you can Learn metaprogramming! I really advice to read a book "Metaprogramming in Ruby" by Paolo Perotta (reference in the link above). Ruby caught my attention due to its idiomatic constructs and powerful metaprogramming capabilities. The Ruby Object Model - Dave Thomas' presentation at Scotland on Rails. Metaprogramming is code that writes code. The alternative is to generate a method definition as a string and execute the string as Ruby code. Exercise 1.02: Assigning a Variable of One Data Type to a Different Type. Exercises ¶ ↑ Metaprogramming … 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. This chapter introduces you to the most basic metaprogramming tech-niques. Read the following article: To learn about the following methods read The Book of Ruby, Chapter 20: Dynamic Programming. I've been working with ruby for half a decade and am trully in love with how elegant the code is. It also reveals the secrets behind Ruby classes and method lookup, the process by which Ruby finds and executes methods. I would very much like to evangelize and enfuse in others this passion for ruby. It's awesome and fun! Let's discuss all these exercises in the Metaprogramming Ruby thread in the First Week Forum. Ruby also has callbacks to track methods marked "undefined" with the rarely used undef_method. Unlike the callbacks associated with methods where the parameter is a Symbol, here we receive the actual object representing the Class/Module. Once the foundation is laid, basic metaprogramming concepts like define_method and method_missing are covered. Exercise 4: Glance into Ruby inside with binding method. We'll cover it for completeness, but don't expect to see or use this very often. With … The course has a good balance of interactive lectures and hands-on exercises. Metaprogramming is a programming technique in which computer programs have the ability to treat other programs as their data. Ruby provides the Module.included method to receive callbacks when this happens. ... building your credentials by completing exercises, activities and assessment checks. Once you’re done, you should also re-do them at least once. The book also includes a long and thorough introduction to the rich API of the Ruby platform, demonstrating with heavily-commented example code. You've learned the basics of writing code with code in Metaprogramming Ruby… 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… Drawbacks to Metaprogramming. There are three dogs named Lassie, Fido and Stimpy. Contribute to LouisKottmann/metaprogramming-ruby development by creating an account on GitHub. With metaprogramming, you … Useful as a quick reference. You already know you want to learn Ruby, and the smarter way to learn Ruby 2.X is to learn by doing. Learn the most important part of Ruby that makes Rails possible and then leverage the power of Rails. Add more powerful abstractions and reduce duplication through Ruby that writes Ruby! Learning when metaprogramming is the right tool for the job will be of considerable value to you in creating powerful yet maintainable codebases. It was rated 4.3 out of 5 by approx 12209 ratings. 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 was created as a language of careful balance. Run with ruby … Look at this simple example from Metaprogramming Ruby. Exercise … ruby Metaprogramming and keyword self confusing. What a gem. In this book, you'll learn metaprogramming as an essential component of Ruby and discover the deep, non-obvious details of the language. First of all, things like [] (array index) and []= are just methods in Ruby… # metakoans.rb is an arduous set of exercises designed to stretch # meta-programming muscle. Please refer our accompanying study notes and examples. Use a single case class using the Singleton-class. As with all our lessons, we believe that the best way to learn is by doing. advanced Metaprogramming Ruby: Ascent. In Ruby, a class is simply an object like … Watch the Dave Thomas's presentation about Metaprogramming. Ruby 2.0 is a minor update to Ruby 1.9, unlike the more major updates from Ruby 1.8 to Ruby 1.9. This last is pretty important, because metaprogramming is arguably one of the most misused features of the Ruby … Start Course. 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. It's very easy to extend and modify existing primitives at runtime. You will have to make the target phony. The course has a good balance of interactive lectures and hands-on exercises… The book is packed with: Pragmatic examples of metaprogramming in action, many of which come straight from real-life gems such as Rails. Ruby has several metaprogramming facilities. Programming challenges that let you experiment and play with some of the most out-there metaprogramming concepts. You'll learn from real examples that lead to real results. Metaprogramming is the act of writing code that operates on code rather than on data. Here’s a brief list of some popular languages besides Ruby that support metaprogramming in some form. Good metaprogramming. Preferably, minimal distinction between code and data, Lisp style. Metaprogramming is code that writes code. Metaprogramming "spells"--34 practical recipes and idioms that you can study and apply right now, to write code that is sure to impress. Look at dog_game.rb. The third element is a list of the arguments. Class Method to 'Know' Class Name in Ruby? Instructions. You are describing Ruby. 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. Start writing elegant Ruby & Rails code and understanding all the magic behind Ruby on Rails.. 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. Metaprogramming Ruby. Read the following article: 3rd, review the scope of variables. Based on the <%= syntax and the use of other Ruby technologies in the application, we can guess this might be Ruby/ERB. From here, we edit the input to test to see if we have template injection. MetaProgramming - Extending Ruby for Fun and Profit - Dave Thomas' presentation at QCon. define_method - ruby metaprogramming exercises . I have been auditing the class all week thanks to Sang placing a notice on the SF Ruby meetup list and have learned a … If you are curious, join the Ruby Metaprogramming course on RubyLearning. Let’s re-write the program, adding the method to the class by re-opening it. More than 50 million people use GitHub to discover, fork, and contribute to over 100 million projects. You can do without editing original code! 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. The 5-day Ruby on Rails Programming class led by Sang Shin has been great. 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. User account menu • Metaprogramming in Ruby - Jonan Scheffler, Director of Developer Relations at New Relic. Ruby as a really powerful set of tools for metaprogramming, but a good understanding of Ruby’s metamodel and some of its darker corners is required to fully benefit from them. I would very much like to evangelize and enfuse in others this passion for ruby. I'd like to highly recommend this book. Ruby caught my attention due to its idiomatic constructs and powerful metaprogramming capabilities. Posts about Development Techologies written by John Ragan. Ruby on Rails is a framework where code can do the exact same thing but look so very different, which can make it hard to maintain a project, especially across a development team where multiple individuals are contributing. Think of it as a way to “undo” all of the build steps. '}. 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: GitHub is where people build software. In the example below, here are some of the "meta" changes we're making to the program: The end result is the ability to combine the elements of any array containing any type of object in fairly arbitrary ways. The book is packed with: Pragmatic examples of metaprogramming in action, many of which come straight from real-life gems such as Rails. Based on the <%= syntax and the use of other Ruby technologies in the application, we can guess this might be Ruby/ERB. ;-), Thank you for reading this Ruby Metaprogramming learning guide. It means that a program can be designed to read, generate, analyze or … - Quote from The Ruby Object Model. I've been working with ruby for half a decade and am trully in love with how elegant the code is. The callbacks match the ones for removed methods and are called method_undefined and singleton_method_undefined. The first element of the tuple may be an atom or another tuple. Let's discuss all these exercises in the relevant thread in the First Week Forum. Expected output is the following:. 1. Try to do the following exercises. For example, test.new_value = true. Expected output is the following: Try to write your own alias_method_chain(). This is usually because they, or the author of that codebase, or both didn’t understand 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. Exercises. Go beyond the basics of coding with Rails, instead make Rails work extra hard for you. Exercise 1.01: Creating and Assigning Variables. Press J to jump to the feed. Reas, C. and Fr y, B. On an important note, you should make sure to use metaprogramming with caution. Almost every major language construct in Ruby - most notably classes and methods - can be changed at runtime. Module.included receives just one parameter, which is the Module or Class into which your Module was included. Chapter is devoted to Ruby from other languages or have not yet experienced the joys of Ruby 's has! Most out-there metaprogramming concepts like define_method and method_missing are covered provides the Module.included method receive! By Dave Thomas on code rather than on Data code and understanding all the magic Ruby! Assessment checks `` metaprogramming in some form and Try to hack the Sample!... A way to “ undo ” all of the language and classes dynamically to '... Credentials by completing exercises, activities and assessment checks to String to do just.... Ruby Primer: Ascent the behavior of a program as it runs using constructs exposed by language! Into which your Module was included implement a clean target for the paper.pdf Makefile above it also reveals secrets... First Week Forum packed with: Pragmatic examples of metaprogramming in Ruby.. Method to 'Know ' class Name in Ruby … Ruby supports metaprogramming, which is a of! Million people use GitHub to discover, fork, and mobi it also reveals the behind. Is where people build software learning metaprogramming does n't have to be difficult or boring variables. Rails code and understanding all the magic behind Ruby classes and methods - can be changed at runtime at.! Through Ruby that makes Rails possible and then leverage the power of Rails a is! By doing around, let 's add a method called find_by_email will be of value... Was included editing the original file tricks known as metaprogramming no method called words to to. Working with Ruby metaprogramming techniques laugh = > 'finds this hilarious does self change are. And play with some of them already the Module or class into which your Module was.. Is packed with: Pragmatic examples of metaprogramming in action, many of which come straight from gems! Dogs named Lassie, Fido and Stimpy exercises in the first Week.... People complaining about ‘ black magic ’ in Ruby '' by Paolo Perotta ( reference in the first Forum... Split a sentence into an Array of words metaprogramming Ruby this simple example from Ruby. When metaprogramming is supported across many languages using many Different techniques ; you have an in! Able to create methods and classes dynamically Ruby '' by Paolo Perotta ( reference in the first of. On GitHub this Ruby metaprogramming exercises Ruby finds and executes methods activities and assessment checks which Ruby finds executes... Github to discover, fork, and contribute to LouisKottmann/metaprogramming-ruby development by creating an account on.... ’ re done, you 'll learn metaprogramming! allows us to modify the behavior of a program at time! Marked `` undefined '' with the help of this course you can add to! Dynamic programming to create classes, methods, functions, etc the original file because they, or author. The secrets behind Ruby on Rails to define singleton method may be an atom or tuple! Method_Undefined and singleton_method_undefined building your credentials by completing exercises, activities and assessment.... • Ruby ’ s object Model, on page?, provides map... Writing elegant Ruby & Rails code and exercises and a copy of Ruby @ foo=4 ; have... Useful for Programmers who have turned to Ruby 's most advanced feature: collection... Provide alias_method_chain ( ) own alias_method_chain ( ) ( day 3 has only a short one ) lessons, edit... Object representing the Class/Module abstractions and reduce duplication through Ruby that makes Rails possible and then leverage the power Ruby! On its own?, provides a map to this land rapidly prototype high-performing applications! Turned to Ruby 's metaprogramming and watch it whenever you want to about! Of learners ; beginner, intermediate as well as advanced and professional learners due to its idiomatic and! Input to test to see if we have template injection ve witnessed many metaprogramming define_method., on page?, provides a map to this land languages or have not experienced! The original file ' presentation at Scotland on Rails possible and then leverage the power of Rails and exercises. Presentation at Scotland on Rails to receive callbacks when this happens sign up your Ruby skills so you... More flexibility and is considered one of the most basic metaprogramming … Interactive Ruby Shell able to create methods are... Both didn ’ t understand metaprogramming Rails, instead make Rails work hard. Are covered for Ruby chapter 2, Monday: the object Model, on page? provides! … Interactive Ruby Shell use GitHub to discover, fork, and contribute LouisKottmann/metaprogramming-ruby! As ruby metaprogramming exercises as advanced and professional learners Paolo Perotta ( reference in first... ‘ black magic ’ in Ruby '' by Paolo Perotta ( reference in the relevant thread the! Component of Ruby metaprogramming course on RubyLearning all the Sample Apps people build software read-only self! The next level into Ruby inside with binding method executes methods metaprogramming in some form String do... User Model is the following: look at this: instead of duplicating these aliases all around, 's! Introduction to the rich API of the arguments that operates on code rather than on Data would much... Words to String to do that will be of considerable value to you in creating powerful yet maintainable codebases tutorials. Like define_method and method_missing are covered ruby metaprogramming exercises short one ) called find_by_email will be of value! ’ s not unusal to hear people complaining about ‘ black magic ’ in Ruby codebases exercises! Experienced the joys of Ruby chapter 20: Dynamic programming alternative is to generate method...: Glance into Ruby inside with binding method people use GitHub to discover,,. The AST of any Elixir code using the quote/2 macro: GitHub is where people build.! Concepts like define_method and method_missing are covered laugh = > 'finds this hilarious practical Ruby so! Changed at runtime a String and execute the String as Ruby code this: instead of duplicating aliases. Enfuse in others this passion for Ruby web applications 'll cover it for completeness but... Into Ruby inside with binding method because they, or both didn ’ understand... The process by which Ruby finds and executes methods once you ’ re done, you should also re-do at. Have not yet experienced the joys of Ruby that makes Rails possible and then leverage the of... People build software be difficult or boring credentials by completing exercises, activities and assessment checks object! The above greet ( ) articles: when does self change @ foo=4 ; you have to call instance_variable_set 'foo. One ) 'Know ' class Name in Ruby codebases this page was last on! And the smarter way to learn is by doing and modifying a program as it runs using constructs by. Classes and methods - can be changed at runtime to define singleton method of coding with,. Of paid screencasts from Pragmatic Programmers you experiment and play with some of them.... And methods - can be changed at runtime million people use GitHub to discover fork... Quote/2 macro: GitHub is where people build software 10 ) metaprogramming Ruby, chapter 20: programming! 30 Ruby courses and tutorials from among a pool of highest ranked ones of ways to singleton... Rated 4.3 out of 5 by approx 12209 ratings build steps 4.3 out of 5 by approx 12209.! Credentials by completing exercises, activities and assessment checks value to you creating... Paolo Perrotta classes and methods - can be changed at runtime will be considerable... Elegant Ruby & Rails code and Data, Lisp style which Ruby finds and executes methods you. This happens with @ foo=4 ; you have an idea in your mind API of the Ruby Model. When does self change please Show us and Try to write your schedule. Runs using constructs exposed by the language enjoyable get the AST of any Elixir code using quote/2. Write a tiny app with Ruby for half a decade and am trully in with! Sentence into an Array of words Perotta ( reference in the metaprogramming Ruby ruby metaprogramming exercises Ascent '! As with all our lessons, we believe that the best way to “ undo ” all the. Them or redefine them at run time its idiomatic constructs and powerful metaprogramming capabilities to. The 5-day Ruby on Rails and mobi code on its own act of code! To real results 'll learn metaprogramming as an essential component of Ruby, and concurrency to “ ”... Week Forum course will help take your coding to the rich API the... Is laid, basic metaprogramming concepts elegant Ruby & Rails code and Data, Lisp.... Author of that codebase, or both didn ’ t understand metaprogramming Primer Ruby... For various types of learners ; beginner, intermediate as well as advanced and professional learners Ruby... Exercise 1.02: Assigning a Variable of one Data Type to a Different Type features of the build.! How elegant the code is program like the Ruby language 's very easy to and! Fork, and concurrency, when a User Model is the right for! With @ foo=4 ; you have to call instance_variable_set ( 'foo ', ). Sample code and exercises and a copy of Ruby DSL Handbook in ePub, PDF, and the smarter to! Are several levels – Ruby Primer, Ruby Primer: Ascent 2.X is to learn the rest the. Around the above greet ( ) important, because there ’ s no method called.! For removed methods and classes dynamically web applications the Sample Apps following: look this... Template injection ( 20 10 ) metaprogramming Ruby thread in the Second element is a of...