Variables

Variables are declared and stored using the = operand. They're immediately preceded by their type, as illustrated below:

Integer x = 0

A variable cannot change type within the same program, or a compiler error will be thrown.

Mutability

All variables are immutable by default, so a special mutable keyword must be used to mark a variable as mutable. This mutability only extends as far as the current scope, so it cannot be mutated outside of the package or module for example...

mutable Integer x = 0
x = 1