methodphitamine | implied block argument it which makes the refining

methodphitamine is a Ruby library. methodphitamine has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

The it() and its() protected methods are added to Kernel so it can be called from anywhere in a Ruby script but not on any particular Object instance. They each simply return a new It instance. The It class has all instance methods stripped from it (except the ones Ruby complains about) to ensure method_missing() catches everything. In the example [1,"2",3].map &its.class.name, the It object first receives the class() method with no arguments via method_missing(). This gets enqueued in the @methods Array and it returns itself to receive any more methods. It then receives the next method, namely name(), and enqueues that alongside the previous method. When no more methods exist, Ruby determines if the It instance has a to_proc() method by calling respond_to?(:to_proc) so this has to be ignored and self suffices as a Ruby true boolean. Then the magic happens. Because map() takes a block (essentially a Proc argument), this can be substituted with a variable or method that returns a block as long as an ampersand prepends it to let the Ruby interpreter know to call to_proc() on it. The It#to_proc() method is invoked, building a custom, dynamic Proc. Because these enumerations yield a variable, the dynamic Proc is executed for each item in the collection and obj consequentially becomes a reference to the current item in the collection. We then run through the enqueued methods with inject(), passing along the return value of executing each method in the order received with arguments intact. When inject() is done, it simply returns the grand product which becomes the return value of the Proc itself. Simple, right? :). I chose to define both it() and its() since methods in Ruby can semantically either mean “the result of this action” or the possessive “this attribute.” For example, it.to_s and it.sort_by are both conceptual actions and its.class.name and its.last are both conceptual attributes.