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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
         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