From: shevegen@... Date: 2018-08-30T19:44:59+00:00 Subject: [ruby-core:88761] [Ruby trunk Feature#15049] [Request] Easily access all keyword arguments within a method Issue #15049 has been updated by shevegen (Robert A. Heiler). I have had a somewhat related idea in that I wanted a way to access all parameters in a simple, short manner. A bit similar to $1 $2 etc... for regexes, just that we could do so programmatically for the arguments passed into a method or a block. I was unable to come up with a short, succinct and elegant way for this though so I gave up on the idea - but I think introspection is great, so +1 for your idea (the idea itself; not sure if kargs is a good name... won't people confuse that with kwargs?). ---------------------------------------- Feature #15049: [Request] Easily access all keyword arguments within a method https://bugs.ruby-lang.org/issues/15049#change-73810 * Author: bherms (Bradley Herman) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- As a developer, I'd like to leverage the power of keyword arguments (requirements, defaults, etc) and then be able to access a hash of all the arguments supplied. ~~~ ruby def foo(bar:, baz: 1, qux: 2...) post('/', body: kargs) end ~~~ This is currently possible by leveraging the RubyVM debug inspector and some meta programming to retrieve the binding and name of the calling method. There is a gem https://github.com/banister/binding_of_caller that abstracts away the logic of crawling through the frame bindings in the debug inspector to find the binding of the caller, but I feel like this functionality would be useful in Ruby. With the binding_of_caller gem, you can hack together a kargs method like so: ~~~ ruby def kargs method(caller_locations(1,1)[0].label).parameters.map do |(_type, name)| [name, binding.of_caller(2).local_variable_get(name)] end.to_h end ~~~ This gets the name of the calling method, pulls the local variables from the method, retrieves the binding, and then retrieves the variables from the binding. By exposing a simpler API to retrieve the caller binding, a `kargs` method could be added to Ruby fairly easily I would think. -- https://bugs.ruby-lang.org/ Unsubscribe: