List (abstract Data Type) - Operations

Operations

Implementation of the list data structure may provide some of the following operations:

  • a constructor for creating an empty list;
  • an operation for testing whether or not a list is empty;
  • an operation for prepending an entity to a list
  • an operation for appending an entity to a list
  • an operation for determining the first component (or the "head") of a list
  • an operation for referring to the list consisting of all the components of a list except for its first (this is called the "tail" of the list.)

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    It may seem strange that any road through such a wilderness should be passable, even in winter, when the snow is three or four feet deep, but at that season, wherever lumbering operations are actively carried on, teams are continually passing on the single track, and it becomes as smooth almost as a railway.
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