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Given any object I can call #public_methods and see all the methods it will respond to. However, I find it would sometimes be handy to get a quick list of all the public methods that are not inherited, i.e. the stuff that's really part of this class.
I found in "Easy way to list public methods for a Ruby object" that if I use:
(Foo.public_methods - Object.public_methods).sort I can filter out a lot of basic Ruby stuff. I'd like to be able to filter everything that was inherited all the way up the chain. If I know the parent class I can filter using it, but I'd like to come up with a generic command that could return an array of the uninherited public methods for any object.
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Like regular interface methods, default methods are implicitly public; there's no need to specify the public modifier. Unlike regular interface methods, we declare them with the default keyword at the beginning of the method signature, and they provide an implementation.
Things aren't public by default because they might contain sensitive information, or at least information that you don't want to expose as part of the class's public interface. Making something public is a bigger decision with more risks than simply making it private, so you are forced to make that decision explicitly.
You cannot stop a derived class from inheriting all the methods of a base class. The best you can do is to make it a nonmember requiring the base object parameter. Then you would have to downcast the object before calling but you could still call it.
A subclass does not inherit the private members of its parent class. However, if the superclass has public or protected methods for accessing its private fields, these can also be used by the subclass.
Just pass false for the inherited argument of public_methods:
"hello".public_methods.include?(:dup) # => true "hello".public_methods(false).include?(:dup) # => false Not an answer to your question, but in case you didn't know, irb does autocompletion, so it's easy to get the list of public methods (especially if you know the beginning of the method you are looking for). Just hit tab; hitting it twice will list all possibilities (including inherited ones, though):
> "nice".d<tab><tab> "nice".delete "nice".delete! "nice".display "nice".downcase "nice".downcase! "nice".dump "nice".dup "nice".define_singleton_method > "nice".<tab><tab> Display all 162 possibilities? (y or n) ... Using pry makes it even easier to see the methods available, broken down by level of inheritance:
[1] pry(main)> cd "nice" [2] pry("nice"):1> ls Comparable#methods: < <= > >= between? String#methods: % * + << <=> == === =~ [] []= ascii_only? bytes bytesize byteslice capitalize capitalize! casecmp center chars chomp chomp! chop chop! chr clear codepoints concat count crypt delete delete! downcase downcase! dump each_byte each_char each_codepoint each_line empty? encode encode! encoding end_with? eql? force_encoding getbyte gsub gsub! hash hex include? index insert inspect intern length lines ljust lstrip lstrip! match next next! oct ord partition prepend replace reverse reverse! rindex rjust rpartition rstrip rstrip! scan setbyte shellescape shellsplit size slice slice! split squeeze squeeze! start_with? strip strip! sub sub! succ succ! sum swapcase swapcase! to_c to_f to_i to_r to_s to_str to_sym tr tr! tr_s tr_s! unpack upcase upcase! upto valid_encoding? locals: _ _dir_ _ex_ _file_ _in_ _out_ _pry_ If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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