What is monkey patching Ruby?
In Ruby, a Monkey Patch (MP) is referred to as a dynamic modification to a class and by a dynamic modification to a class means to add new or overwrite existing methods at runtime. This ability is provided by ruby to give more flexibility to the coders.
Where do monkey patches go?
Technically you can open it (the class; and add your method) anywhere. I usually make a special file called monkey_patches. rb and put it in config/initializers or in a misc folder in my Rails app so if theres ever a conflict I know where to look. Also I’d advise to use a Module to wrap the monkey patch.
Where do I put my monkey patches in Rails?
The lib/ directory in Rails is not autoloaded, so to apply these patches we need to run some code when our app boots. The best place to do this is to create a file called monkey_patches. rb under config/initializers/ . All files in this directory are executed when Rails boots.
Is monkey patching a good idea?
Monkey patching is good for testing or mocking out behavior. They can be localized in factory/class decorators/metaclasses where they create a patched new class/object from another object to help with “cross-cutting concerns” in between ALL methods like logging/memoization/caching/database/persistance/unit conversion.
What is monkey patching in Python with example?
In Python, the term monkey patch refers to dynamic (or run-time) modifications of a class or module. In Python, we can actually change the behavior of code at run-time. We use above module (monk) in below code and change behavior of func() at run-time by assigning different value.
Why is it called monkey patching?
The term monkey patch seems to have come from an earlier term, guerrilla patch, which referred to changing code sneakily – and possibly incompatibly with other such patches – at runtime. The word guerrilla, homophonous with gorilla (or nearly so), became monkey, possibly to make the patch sound less intimidating.
What is prepend in Ruby?
Available since Ruby 2, prepend is a bit less known to Rubyists than its two other friends. It actually works like include, except that instead of inserting the module between the class and its superclass in the chain, it will insert it at the bottom of the chain, even before the class itself.
What is the difference between collect and map in Ruby?
There’s no difference, in fact map is implemented in C as rb_ary_collect and enum_collect (eg. there is a difference between map on an array and on any other enum, but no difference between map and collect ). Why do both map and collect exist in Ruby? The map function has many naming conventions in different languages.
What is MetaProgramming in Ruby?
Metaprogramming is a technique in which code operates on code rather than on data. It can be used to write programs that write code dynamically at run time. MetaProgramming gives Ruby the ability to open and modify classes, create methods on the fly and much more.
What is dry in Ruby?
#Don’t Repeat Yourself (DRY) in Ruby on Rails. #DRY (Don’t Repeat Yourself) is a principle of Software Development to reducing repetition of information or codes. We can #apply DRY quite broadly to database schema, test plan, system, even documentation.