From: Stu <stu@...>
Date: 2011-05-02T07:54:32+09:00
Subject: Re: Understanding Ruby Inside Out

One last thing to try which may help you. If you pass false to
instance_methods you can get the list of methods directly associated
with that class without the inherited methods:

>> String.instance_methods(false)

=> [:<=>, :==, :===, :eql?, :hash, :casecmp, :+, :*, :%, :[], :[]=,
:insert, :length, :size, :bytesize, :empty?, :=~, :match, :succ,
:succ!, :next, :next!, :upto, :index, :rindex, :replace, :clear, :chr,
:getbyte, :setbyte, :to_i, :to_f, :to_s, :to_str, :inspect, :dump,
:upcase, :downcase, :capitalize, :swapcase, :upcase!, :downcase!,
:capitalize!, :swapcase!, :hex, :oct, :split, :lines, :bytes, :chars,
:codepoints, :reverse, :reverse!, :concat, :<<, :crypt, :intern,
:to_sym, :ord, :include?, :start_with?, :end_with?, :scan, :ljust,
:rjust, :center, :sub, :gsub, :chop, :chomp, :strip, :lstrip, :rstrip,
:sub!, :gsub!, :chop!, :chomp!, :strip!, :lstrip!, :rstrip!, :tr,
:tr_s, :delete, :squeeze, :count, :tr!, :tr_s!, :delete!, :squeeze!,
:each_line, :each_byte, :each_char, :each_codepoint, :sum, :slice,
:slice!, :partition, :rpartition, :encoding, :force_encoding,
:valid_encoding?, :ascii_only?, :unpack, :encode, :encode!, :to_r,
:to_c]

This is all the methods associated with the top level String class.

~Stu