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