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.
Ruby metaprogramming examples.
Imagine that you have a database table for users that have columns such as name and email.
That s why in this article.
Examples of metaprogramming a basic example.
Please refer our accompanying study notes and examples.
Self quote from programming ruby 1 9.
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 the example below here are some of the meta changes we re making to the program.
Add a method named foldl to ruby s native array class.
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This involves inspecting and modifying a program as it runs using constructs exposed by the language.
We re going to look at some popular open source projects using ruby 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.
Let s begin with a basic example.
You may have read about ruby metaprogramming before.
Ruby metaprogramming by example.
Ruby metaprogramming one of the most interesting aspects of ruby enables the programming language to achieve an extreme level of expressiveness.
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 often presented as a very nebulous and dangerous concept one that is difficult to explain and hard.
Quote from the ruby object model.
1st review the built in read only variable self.
I m going to start with an example from the ruby on rails framework.
Self the current default object.
In this article toptal engineer nikola todorovic demystifies.
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.
Metaprogramming is the act of writing code that operates on code rather than on data.
Let s start learning ruby metaprogramming.
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.
2nd review singleton.
But it can be a bit confusing if you don t have a few specific examples.
When does self change.
Obviously the ruby on rails framework doesn t know what columns that you re going to have for the.
