List-like structures

• Lists are collections of items.

• 2 key kinds of list:

  • The array, indexed by a number.

    • Items in an array are intrinsically sequential, even though you can randomly access them.
  • The hash, indexed by a string

    • Items in a hash are not intrinsically ordered
    • The word "hash" comes from the Perl community. Sometimes python people with use other terms for this data structure.

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