Our Programs Are Fun To Use

- Jeff Atwood
- March 9, 2015
- Uncategorized

These two imaginary guys influenced me heavily as a programmer.

Instead of guaranteeing fancy features or compatibility or error free operation, Beagle Bros software promised something else altogether: fun.

Playing with the Beagle Bros quirky Apple II floppies in middle school and high school, and the smorgasboard of oddball hobbyist

Parsing YAML 1.1 with Ruby

April 12, 2011

To parse YAML with Ruby, do not use the YAML module, use Psych (which ships with Ruby 1.9.2, though there is also a gem).

The reason is that YAML uses the unmaintained Syck library, whereas Psych uses the modern LibYAML:

>> require 'yaml'
>> YAML.load("%YAML 1.1\n---\n'test'")  # %YAML directive not supported
=> "%YAML 1.1 --- 'test'"

>> require 'psych'
>> Psych.load("%YAML 1.1\n---\n'test'")  # all good
=> "test"

P.S. Even if the YAML you are parsing is very simple, YAML silently runs into problems with escaped whitespace (“foo\ bar”), erroneously leaving the backslashes in the output. Psych handles this just fine.

P.P.S. YAML will use Psych instead of Syck as its engine if you have require 'psych' before require 'yaml' – thanks to Benoit Daloze for pointing this out. If this implicit behavior is causing pains for you, especially with Rails or Bundler, I recommend you read Matthew Kocher’s post about YAML, Psych, and Syck (and the discussion in the comments there).

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