import QtQuick 2.0 Item { property bool test: false property var nullOne: null property var nullTwo property var undefOne: undefined property var undefTwo Component.onCompleted: { nullTwo = null; undefTwo = undefined; if (nullOne != null) return; if (nullOne != nullTwo) return; if (undefOne != undefined) return; if (undefOne != undefTwo) return; test = true; } }