YAML

Table of contents

1. 1. YAML Syntax and Scalars

   0 tasks
   • Write bare, single-quoted, and double-quoted strings correctly
   • Identify integers, floats, booleans, and null from their YAML representation
   • Predict when implicit typing fires (yes/no/true/false/null)

2. 2. Lists and Sequences

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   • Write block-style sequences using dash-space notation
   • Write flow-style sequences inline
   • Nest sequences inside mappings and vice versa

3. 3. Mappings

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   • Write block-style key-value mappings
   • Write flow-style mappings inline
   • Handle string keys that need quoting

4. 4. Nesting and Indentation

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   • Express arbitrarily deep hierarchy using consistent indentation
   • Avoid tab characters in YAML
   • Write lists of mappings and mappings of lists

5. 5. Multiline Strings

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   • Use literal block (|) to embed newline-preserving text
   • Use folded block (>) to embed paragraph-wrapped text
   • Apply chomping indicators (-, +) to control trailing newlines

6. 6. Anchors and Aliases

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   • Define a reusable anchor with &name
   • Reference it with *name
   • Merge a mapping anchor with <<: *name

7. 7. Explicit Types, Tags, and Documents

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   • Force string type with !!str to prevent implicit coercion
   • Use --- to separate multiple documents in one file
   • Apply !!int and !!float to override string values

8. 8. Implicit Typing Gotchas

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   • Identify values that YAML 1.1 misinterprets (yes/no/on/off/NO/country codes)
   • Apply quotes or !!str to prevent the Norway problem
   • Audit a real YAML config for implicit-typing traps