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a , an

Article, one

  • The word a or an can be used in place of one in conjunction with a number word or a unit.
    • a million
    • an hour
    • an inch

Keyword

The word a or an is a keyword that is part of a number of commands, operators, and expressions.

  • is a, is not an

    • the "is a" operator is used to determine whether a variable or value is of a particular type

      Example:

      if it is a number then add it to total
  • a new object, create an object

  • there is a, there is not an

  • an empty list