qtdoc/doc/snippets/qmlapp/codingconventions/javascript.qml

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

import QtQuick

Rectangle {

//![0]
Rectangle {
    color: "blue"
    width: parent.width / 3
}
//![0]

//![1]
Rectangle {
    color: "blue"
    width: {
        var w = parent.width / 3;
        console.debug(w);
        return w;
    }
}
//![1]

//![2]
function calculateWidth(object : Item) : double
{
    var w = object.width / 3;
    // ...
    // more javascript code
    // ...
    console.debug(w);
    return w;
}

Rectangle {
    color: "blue"
    width: calculateWidth(parent)
}
//![2]
}