lazy_invocation.rb

require 'set'

def figure_it_out(procs, **params)
  params_provided = params.keys.to_set
  procs = procs.each_with_object({}) {|proc, lookup| lookup[proc.parameters.transpose[1].to_set] = proc}
  procs[params_provided][**params]
  rescue NoMethodError
    raise "Unknown set of params, slacker"
end

volumes = []
volumes << -> (length:, width:, depth:) {
 length * width * depth
}
volumes << -> (radius:, height:) {
 3.14 * radius * radius * height
}
volumes << -> (side:) {
 side * side * side
}

figure_it_out(volumes, side: 10)