Variables
Declaration
<variable_declaration> ::= "let" ["mut"] <identifier> [":" <type_signature>] ["=" <expression>] ";" ;Dependencies:
<identifier><type_signature><expression>
The <variable_declaration> marks the declaration of a variable. The optional
mut keyword marks the variable as mutable. The variable may optionally be
given a type annotation and/or be assigned at the point of declaration.
Constants
<constant_assignment> ::= "const" <identifier> [":" <type_signature>] "=" <expression> ";" ;Dependencies:
<identifier><type_signature><expression>
The <constant_assignment> declares a compile-time constant. Unlike let,
constants require an initializer and are immutable. By convention, constant
names are written in UPPER_SNAKE_CASE.
Assignment
<variable_assignment> ::= <expression> "=" <expression> ";" ;Dependencies:
<expression>
The <variable_assignment> assigns a value to a target expression. The
left-hand side is a full expression, supporting simple identifiers as well
as field access (a.b = x), array indexing (arr[i] = x), and other
assignable forms.
In addition to simple assignment, Edge supports the following compound assignment operators that combine an arithmetic or bitwise operation with assignment:
| Operator | Meaning |
|---|---|
+= | add and assign |
-= | subtract and assign |
*= | multiply and assign |
/= | divide and assign |
%= | modulo and assign |
**= | exponentiate and assign |
&= | bitwise AND and assign |
|= | bitwise OR and assign |
^= | bitwise XOR and assign |
>>= | right-shift and assign |
<<= | left-shift and assign |