To_yaml and options hash

ruby-talk
1

iccording to the docs, this should emit the version:

~/eg/ruby > ruby -r yaml -e ‘print([0,1,2].to_yaml(:UseVersion => true))’

but it simply outputs

···
  • 0
  • 1
  • 2

other options seem to be ignored too (:Separator, etc). my questions are

a) what’s up with the options hash? it does not seem to work the way the
docs imply:

…
puts [[ ‘Crispin’, ‘Glover’ ]].to_yaml( :Indent => 4, :UseHeader => true, :UseVersion => true )
# prints:
# — %YAML:1.0
# -
# - Crispin
# - Glover
…

~/eg/ruby > ruby -r yaml -e “puts [[‘Crispin’,‘Glover’]].to_yaml(:Indent=>4,:UseHeader=>true,:UseVersion=>true)”

    • Crispin
    • Glover

b) is there an option that will cause

  [ 0, 1, 2 ].to_yaml

  to be emitted as

    [ 0, 1, 2 ]

  rather than

    ---
    - 0
    - 1
    - 2

thanks for any assistance.

-a

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