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Codes / Error Code 005

Error Code 005

Overview

This error occurs when you try to assign a new value to a variable or object marked as immutable. Immutable variables cannot be modified after their initial assignment.

Details

  • Common Causes:

    • Attempting to modify an immutable variable.
    • Reassigning a value to a property of an immutable object.

  • Example:

void main() {
    immutable int x = 5;
    x = 10; // Error: cannot modify immutable variable `x`
}
  • Solution:
    • Use mutable or const instead of immutable if modification is necessary: 
      void main() {
    int x = 5;
    x = 10; // Valid
}
    • Reassign values to new variables if immutability must be preserved: 
      void main() {
    immutable int x = 5;
    int y = x + 5; // Assign to a new variable
}