Arity

function = Arity::Function.make(some_callable)
# note the use of .make versus .new
# some_callable should respond to :call
# otherwise, .make will raise an Arity::NotCallableError
# to avoid raising, pass {silent: true} to .make and it will return nil instead

function.arity
# delegates to Ruby's built-in arity logic

function.takes?(arg_count: 3, keywords: [:things])
# determines if the supplied method parameter structure is valid.

function.runnable?('thing-1','thing-2','thing-3', things: 3)
# computes the parameter structure and delegates to .takes?

function.run('thing-1','thing-2','thing-3', things: 3)
# calls .call on the callable with the supplied parameters