confusing-expression-statement.qdoc

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// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
 
/*!
\page qmllint-warnings-and-errors-confusing-expression-statement.html
\ingroup qmllint-warnings-and-errors
 
\title Confusing expression statement
\brief [confusing-expression-statement] Confusing expression statements.
 
\qmllintwarningcategory confusing-expression-statement
 
\section1 Expression statement has no obvious effect
 
\section2 What happened?
You used an expression statement that has no obvious effect.
 
\section2 Why is that bad?
It makes the code more difficult to read and may cause confusion. Usually,
it indicates that some expression result was ignored.
 
The expression statement is compiled into bytecode and evaluated at runtime,
despite not having any effect.
 
\section2 Example
\qml
import QtQuick
 
Item {
    function add(a: int, b: int) : int {
        a + b
    }
}
\endqml
To fix this warning, remove the expression without effect or use the
expression result.
 
\qml
import QtQuick
 
Item {
    function add(a: int, b: int) : int {
        return a + b
    }
}
\endqml
*/