Variables

Declaration

Variables in Arden are declared using the syntax name: Type = value;.

age: Integer = 30;
name: String = "Alice";

Note: The let keyword is optional. Both let x: Integer = 10; and x: Integer = 10; are valid and equivalent.

By default, variables are immutable. Once assigned, their value cannot be changed.

x: Integer = 10;
// x = 20; // Error: Cannot assign to immutable variable

To make a variable mutable, use the mut keyword:

mut count: Integer = 0;
count = count + 1; // OK

Arden supports variable shadowing. You can declare a new variable with the same name as a previous one.

x: Integer = 5;
x: Integer = x + 1; // New variable 'x' shadows the old one

This is often useful for type transformations:

input: String = "100";
input: Integer = to_int(input); // Shadowing with different type