Operators

Some operators have different meanings when used either infix or prefix notation.

For example, the - operator when used in infix notation denotes subtraction (2 - 1 # == 1) whereas with prefix notation gives negation (-1 # == -1).

The operator meanings in the lists below are infix notation unless stated otherwise.

Arithmetic

• +

  • Addition (infix)

    • 1 + 2 # == 3

  • Unary plus (prefix)

    • +1

• -

  • Subtraction (infix)

    • 2 - 1 # == 1

  • Unary minus (prefix)

    • -1

• *

  • Multiplication

    • 2 * 3 # == 6

• /

  • Division

    • 5 / 2 # == 2.5

• //

  • Integer Division (convert to integer by dropping the floating point)

    • 5 // 2 # == 2

• %

  • Modulo (remainder of a division)

    • 5 % 2 # == 1

Logic

• ==

  • Equality

    • 1 == 1 # true

• !=

  • Inequality

    • 1 != 1 # false

• is

  • Object equality

  • While == will check if two objects have the same value, is will check if they are the exact same object (i.e. two variables reference the same object, etc.)

    • true is true # true

• not

  • Logical NOT

    • not false # true

• and

  • Logical AND

    • true and 1 == 1 # true

• or

  • Logical OR

    • true or false # true

• <

  • Less Than

    • 2 < 3 # true

  • Class Inheritance

    • Dog < Animal

• >

  • Greater Than

    • 2 > 3 # false

• <=

  • Less Than or Equal To

    • 3 <= 3 # true

• >=

  • Greater Than or Equal To

    • 3 >= 3 # true

Other

• =

  • Assignment

    • let x: int = 3

• ->

  • Return Type Identifier

    • def test() -> int = return 3