introspection/native_methods_answered.rb

tests/_examples/introspection/native_methods_answered.rb in the metorex repository.

# The methods core classes answer natively are reported the way any other
# method is, by respond_to?, defined? and method_defined?.
list = [1, 2]
p(list.respond_to?(:each), list.respond_to?(:size), list.respond_to?(:+))
p(defined?(list.each), defined?(list.no_such_method))
p({ a: 1 }.respond_to?(:each_pair), "text".respond_to?(:chomp), :name.respond_to?(:to_proc))
p(7.respond_to?(:between?), 1.5.respond_to?(:nan?), nil.respond_to?(:to_a), true.respond_to?(:&))
p(Object.new.respond_to?(:instance_exec), Object.new.respond_to?(:chomp), Object.new.respond_to?(:puts))
p(Array.method_defined?(:each), Array.method_defined?(:each, false), Class.new(Array).method_defined?(:each, false))
p(Integer.public_method_defined?(:between?), Comparable.method_defined?(:clamp), Array.private_method_defined?(:each))
p(Class.new.method_defined?(:__send__))

Output:

true
true
true
"method"
nil
true
true
true
true
true
true
true
true
false
false
true
true
false
true
true
false
true