CODEWITHSUNDEEP
rubyruby-2.1
omribahumi
omribahumi

Reputation: 2131

Array#to_s in Ruby 2.1 broke my code

This code broke on Ruby 2.1

class Test
  def to_s()
    "hi"
  end
end

puts [Test.new(), Test.new()].to_s

Ruby 1.9.3:

$ ruby --version
ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]
$ /opt/chef/embedded/bin/ruby test.rb
[hi, hi]

Ruby 2.1:

$ ruby --version
ruby 2.1.4p265 (2014-10-27 revision 48166) [x86_64-linux]
$ ruby test.rb
[#<Test:0x000000022ac400>, #<Test:0x000000022ac3d8>]

Is this documented somewhere? How can the old behavior be preserved?

Upvotes: 4

Views: 126

Answers (3)

Max
Max

Reputation: 22385

You don't need to_s. puts does the work for you

puts [Test.new(), Test.new()]
# hi
# hi

If you want the brackets, that's what inspect is for (in which case it makes sense that you would need to define Test#inspect).

Upvotes: 0

the Tin Man
the Tin Man

Reputation: 160621

Your code:

puts [Test.new(), Test.new()].to_s

is a questionable use of Array.to_s. Instead I'd use:

puts [Test.new(), Test.new()].map(&:to_s)

While I can see that the first use makes sense, the second use makes more sense and should work in any version of Ruby.

Upvotes: 5

Adrian
Adrian

Reputation: 15171

On ruby 2.1.5:

class Test
  def to_s
    "hi"
  end

  alias inspect to_s # add this line
end

puts [Test.new, Test.new].to_s
#=> [hi, hi]

This seems like a bug to me. If it is intended behavior, that is really annoying.

Upvotes: 1

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