visitSetExpr method

@override Object? visitSetExpr(Set expr)

Implementation

@override
Object? visitSetExpr(Expr.Set expr) {
  Object? object = evaluate(expr.object);
  Object? value = evaluate(expr.value);
  if (object is LoxInstance) {
    object.set(expr.name, value);
    return value;
  }
  if (object is LoxSetCallable) {
    object.set(expr.name, value);
    return value;
  }
  throw RuntimeError(expr.name, "Only instances have set properties.");
}