Ruby Metaprogramming Examples

Let s begin with a basic example. In this article toptal engineer nikola todorovic demystifies. Imagine that you have a database table for users that have columns such as name and email.

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Ruby metaprogramming examples. Nov 20 th 2015 10 34 am. I m going to start with an example from the ruby on rails framework. Please refer our accompanying study notes and examples. Ruby metaprogramming by example.

In the example below here are some of the meta changes we re making to the program. 1st review the built in read only variable self. 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 writing programs that write programs.

Ruby is an interpreted high level general purpose programming language it was designed and developed in the mid 1990s by yukihiro matz matsumoto in japan. That s why in this article. You may have read about ruby metaprogramming before. Metaprogramming is often presented as a very nebulous and dangerous concept one that is difficult to explain and hard.

All of them use some form of metaprogramming. But it can be a bit confusing if you don t have a few specific examples. Ruby is dynamically typed and uses garbage collection it supports multiple programming paradigms including procedural object oriented and functional programming according to the creator ruby was influenced by perl smalltalk eiffel. It is because of this very feature that many gems such as rspec and activerecord can work the way they do.

Ruby metaprogramming one of the most interesting aspects of ruby enables the programming language to achieve an extreme level of expressiveness. We re going to look at some popular open source projects using ruby metaprogramming. Self the current default object. Let s start learning ruby metaprogramming.

Quote from the ruby object model. In ruby the term metaprogramming refers to the dynamic nature of the language which allows you to define and redefine methods and classes at runtime. Self quote from programming ruby 1 9. Metaprogramming is the act of writing code that operates on code rather than on data.

Obviously the ruby on rails framework doesn t know what columns that you re going to have for the. This involves inspecting and modifying a program as it runs using constructs exposed by the language. In ruby the term metaprogramming refers to the dynamic nature of the language which allows you to define and redefine methods and classes at runtime. Read the following articles.

When does self change. Examples of metaprogramming a basic example. Add a method named foldl to ruby s native array class. Metaprogramming is often presented as a very nebulous and dangerous concept one that is difficult to explain and hard to wrap your head around and thus should be avoided.