EmptyStringLiteral

Flags uses of an empty string literal ("").


Inspection type: LanguageOpportunities

Default severity: Warning

Reasoning

Standard library constant 'vbNullString' is more explicit about its intent, and should be preferred to a string literal. While the memory gain is meaningless, an empty string literal still takes up 2 bytes of memory, but 'vbNullString' is a null string pointer, and doesn't

Quick-Fixes

The following quick-fixes are available for this inspection:

  • IgnoreOnce: Adds an '@Ignore annotation to ignore a specific inspection result. Applicable to all inspections whose results can be annotated in a module.
  • ReplaceEmptyStringLiteralStatement: Replaces empty string literals '""' with the 'vbNullString' constant.

Examples

Each example is a self-contained MCVE showing the feature in a single specific scenario.

Standard Module
Named Module1 by default, these are general-purpose standard procedural modules.
Class Module
Named Class1 by default, these modules define the default interface for an object of that type.
Predeclared Class
A class module with its VB_PredeclaredId attribute set to True (with or without a @PredeclaredId annotation).
Interface Module
Abstract interfaces are class modules (with or without an @Interface annotation) whose default interface is not a class type intended to be instantiated.
UserForm Module
A predeclared class with a design-time visual designer using the MSForms UI framework.
Document Module
Owned by the host application, these class modules belong to the host document and may handle various events fired by the host application.

The following code should trigger this inspection:

Module1

Public Sub DoSomething(ByVal foo As String)
    If foo = "" Then
        ' ...
    End If
End Sub

Back to list

The content of this page was generated from xml/comments in the source code compiled into Rubberduck.CodeAnalysis.xml. Edit this page