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Slices usage and internals (link) - Coggle Diagram

- - - - [4]int & [5]int has different types
    - - passing an array will make a copy of its contents
- - - - allocates an array, return slice that refers to the array
      - cap when omitted defaults to specified length (len)
    - - specify half-open range with two indices e.g. b[1:4]