Go Concepts - Operators

External

• Go Specification - Operators: https://golang.org/ref/spec#Operators

Internal

• Go Lexical Structure

+

Addition or concatenation. The compiler figures out the semantics based on the operands' types.

Applies to:

• strings

-

Subtraction

*

* is the multiplication operator.

* is also used with pointers as dereference operator: reference and dereference operators.

&

& is the reference operator: reference and dereference operators.

/

Division

%

Remainder

=

The assignment operator.

+=

Addition and assignment.

==

The equality operator. Returns a boolean value.

[]

"[]" is the indexing operator. If the index is out of bounds, the runtime generates a run-time panic:

panic: runtime error: index out of range

Applies to:

• strings
• arrays

:=

Variable declaration and assignment. Also known as short variable declaration operator.

Reference and Dereference Operators

Define * and &.

Also see pointers.