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class Object
##
# call-seq:
# obj.tap{|x|...} -> obj
#
# Yields <code>x</code> to the block, and then returns <code>x</code>.
# The primary purpose of this method is to "tap into" a method chain,
# in order to perform operations on intermediate results within the chain.
#
# (1..10) .tap {|x| puts "original: #{x.inspect}"}
# .to_a .tap {|x| puts "array: #{x.inspect}"}
# .select {|x| x%2==0} .tap {|x| puts "evens: #{x.inspect}"}
# .map { |x| x*x } .tap {|x| puts "squares: #{x.inspect}"}
#
def tap
yield self
self
end
end
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