ruby metaprogramming exercises

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

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