void.qdoc

Go to the documentation of this file.

// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
 
/*!
\ingroup qmllint-warnings-and-errors
 
\title Do not use void in expressions
\brief [void] A void expression was used.
 
\qmllintwarningcategory void
 
\section1 Do not use void expressions
 
\section2 What happened?
A JavaScript void expression was used.
 
\section2 Why is this bad?
The void expression has become mostly redundant and can obscure the logic of
some code by suppressing returned values. It is also prohibited in many code
styles for being non-obvious and hard to read.
 
\section2 Example
\qml
import QtQuick
 
Item {
    function undef() {
        return void 0
    }
 
    function f() {
        return void someFunction()
    }
}
\endqml
To fix this warning, remove or replace the use of void:
\qml
import QtQuick
 
Item {
    function undef() {
        return undefined
    }
 
    function f() {
        somefunction()
    }
}
\endqml
*/