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