13.1 Mutating Variables

      13.1.1 Mutating Variables in Memory

      13.1.2 Variable Mutation and Aliasing

      13.1.3 Mutating Variables versus Mutating Data Fields

      13.1.4 Mutating Parameters in Function Calls

      13.1.5 Mutating Top-Level Variables within Functions

      13.1.6 The Many Roles of Variables

    13.2 Mutable Lists