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