Ruby Metaprogramming Examples

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Ruby metaprogramming examples.

Quote from the ruby object model. That s why in this article. Imagine that you have a database table for users that have columns such as name and email. All of them use some form of metaprogramming.

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. In this article toptal engineer nikola todorovic demystifies. Ruby metaprogramming by example. In the example below here are some of the meta changes we re making to the program.

We re going to look at some popular open source projects using ruby metaprogramming. You may have read about ruby metaprogramming before. Self the current default object. Please refer our accompanying study notes and examples.

2nd review singleton. When does self change. Metaprogramming is the act of writing code that operates on code rather than on data. Self quote from programming ruby 1 9.

It is because of this very feature that many gems such as rspec and activerecord can work the way they do. But it can be a bit confusing if you don t have a few specific examples. Obviously the ruby on rails framework doesn t know what columns that you re going to have for the. For example when a user model is defined in rails with email as an attribute a method called find by email will be generated.

Let s start learning ruby metaprogramming. 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. Ruby metaprogramming one of the most interesting aspects of ruby enables the programming language to achieve an extreme level of expressiveness. Examples of metaprogramming a basic example.

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. 1st review the built in read only variable self. 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. Nov 20 th 2015 10 34 am.

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. I m going to start with an example from the ruby on rails framework. Metaprogramming is often presented as a very nebulous and dangerous concept one that is difficult to explain and hard. This involves inspecting and modifying a program as it runs using constructs exposed by the language.