YAML

Have you ever wondered what the fuck are those pointers in yaml files?

Well here is example that explains it all:

---
- &CENTER { x: 1, y: 2 }
- &LEFT { x: 0, y: 2 }
- &BIG { r: 10 }
- &SMALL { r: 1 }

# All the following maps are equal:

- # Explicit keys
  x: 1
  y: 2
  r: 10
  label: center/big

- # Merge one map
  <<: *CENTER
  r: 10
  label: center/big

- # Merge multiple maps
  <<: [*CENTER, *BIG]
  label: center/big

- # Override
  <<: [*BIG, *LEFT, *SMALL]
  x: 1
  label: center/big