Ruby Metaprogramming Examples

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 examples.

Self the current default object. Read the following articles. When does self change. I m going to start with an example from the ruby on rails framework.

Add a method named foldl to ruby s native array class. Ruby metaprogramming one of the most interesting aspects of ruby enables the programming language to achieve an extreme level of expressiveness. Metaprogramming is writing programs that write programs. In this article toptal engineer nikola todorovic demystifies.

But it can be a bit confusing if you don t have a few specific examples. Ruby metaprogramming by example. Please refer our accompanying study notes and examples. Imagine that you have a database table for users that have columns such as name and email.

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. For example when a user model is defined in rails with email as an attribute a method called find by email will be generated. 2nd review singleton.

Metaprogramming is often presented as a very nebulous and dangerous concept one that is difficult to explain and hard. Examples of metaprogramming a basic example. We re going to look at some popular open source projects using ruby metaprogramming. Let s start learning ruby metaprogramming.

Quote from the ruby object model. Obviously the ruby on rails framework doesn t know what columns that you re going to have for the. 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. Nov 20 th 2015 10 34 am.

It is because of this very feature that many gems such as rspec and activerecord can work the way they do. Let s begin with 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. You may have read about ruby metaprogramming before.

All of them use some form of metaprogramming. Metaprogramming is the act of writing code that operates on code rather than on data. 1st review the built in read only variable self. 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.