class Array
# Array.wrap is like Kernel#Array except:
#
# * If the argument responds to +to_ary+ the method is invoked. Kernel#Array
# moves on to try +to_a+ if the returned value is +nil+, but Arraw.wrap returns
# such a +nil+ right away.
# * If the returned value from +to_ary+ is neither +nil+ nor an +Array+ object, Kernel#Array
# raises an exception, while Array.wrap does not, it just returns the value.
# * It does not call +to_a+ on the argument, though special-cases +nil+ to return an empty array.
#
# The last point is particularly worth comparing for some enumerables:
#
# Array(:foo => :bar) # => [[:foo, :bar]]
# Array.wrap(:foo => :bar) # => [{:foo => :bar}]
#
# Array("foo\nbar") # => ["foo\n", "bar"], in Ruby 1.8
# Array.wrap("foo\nbar") # => ["foo\nbar"]
def self.wrap(object)
if object.nil?
[]
elsif object.respond_to?(:to_ary)
object.to_ary
else
[object]
end
end
end