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Crystaline Ruby

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  1. Copies and Conversions
    9 Topics
  2. Numbers, Times, and Dates
    8 Topics
  3. Fun with Arrays and Hashes
    8 Topics
  4. Structures
    7 Topics
  5. Randomness
    3 Topics
  6. Pipelines
    2 Topics
  7. Miscellany
    5 Topics
  8. Conclusion and Next Steps
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How to use Hash#fetch to provide defaults for missing keys, and why you might prefer that to other techniques for defaulting values.

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