diff --git a/src/browseropenorsavequestion.cpp b/src/browseropenorsavequestion.cpp
--- a/src/browseropenorsavequestion.cpp
+++ b/src/browseropenorsavequestion.cpp
@@ -267,8 +267,8 @@
                 KGuiItem::assign(d->openWithButton, openWithItem);
                 d->openWithButton->setMenu(menu);
                 QObject::connect(menu, &QMenu::triggered, d, &BrowserOpenOrSaveQuestionPrivate::slotAppSelected);
-                for (KService::List::const_iterator it = apps.begin(); it != apps.end(); ++it) {
-                    QAction *act = createAppAction(*it, d);
+                for (auto& app : apps) {
+                    QAction *act = createAppAction(app, d);
                     menu->addAction(act);
                 }
                 QAction *openWithDialogAction = new QAction(d);
diff --git a/src/partbase.h b/src/partbase.h
--- a/src/partbase.h
+++ b/src/partbase.h
@@ -131,9 +131,9 @@
      * \code
      * if( factory() )
      * {
-     *   QList<KParts::Plugin *> plugins = KParts::Plugin::pluginObjects( this );
-     *   for(int i = 0; i != plugins.size(); ++i) {
-     *      factory()->addClient( plugins[i] );
+     *   const QList<KParts::Plugin *> plugins = KParts::Plugin::pluginObjects(this);
+     *   for (auto* plugin : plugins) {
+     *      factory()->addClient(plugin);
      *   }
      * }
      * \endcode
diff --git a/src/partmanager.cpp b/src/partmanager.cpp
--- a/src/partmanager.cpp
+++ b/src/partmanager.cpp
@@ -315,8 +315,8 @@
 
 Part *PartManager::findPartFromWidget(QWidget *widget, const QPoint &pos)
 {
-    for (QList<Part *>::iterator it = d->m_parts.begin(), end = d->m_parts.end(); it != end; ++it) {
-        Part *part = (*it)->hitTest(widget, pos);
+    for (auto* p : qAsConst(d->m_parts)) {
+        Part *part = p->hitTest(widget, pos);
         if (part && d->m_parts.contains(part)) {
             return part;
         }
@@ -326,9 +326,9 @@
 
 Part *PartManager::findPartFromWidget(QWidget *widget)
 {
-    for (QList<Part *>::iterator it = d->m_parts.begin(), end = d->m_parts.end(); it != end; ++it) {
-        if (widget == (*it)->widget()) {
-            return (*it);
+    for (auto* part : qAsConst(d->m_parts)) {
+        if (widget == part->widget()) {
+            return part;
         }
     }
     return nullptr;
diff --git a/src/plugin.cpp b/src/plugin.cpp
--- a/src/plugin.cpp
+++ b/src/plugin.cpp
@@ -135,21 +135,19 @@
 
 void Plugin::loadPlugins(QObject *parent, const QList<PluginInfo> &pluginInfos, const QString &componentName)
 {
-    QList<PluginInfo>::ConstIterator pIt = pluginInfos.begin();
-    QList<PluginInfo>::ConstIterator pEnd = pluginInfos.end();
-    for (; pIt != pEnd; ++pIt) {
-        QString library = (*pIt).m_document.documentElement().attribute(QStringLiteral("library"));
+    for (auto& pluginInfo : pluginInfos) {
+        const QString library = pluginInfo.m_document.documentElement().attribute(QStringLiteral("library"));
 
         if (library.isEmpty() || hasPlugin(parent, library)) {
             continue;
         }
 
-        Plugin *plugin = loadPlugin(parent, library, (*pIt).m_document.documentElement().attribute(QStringLiteral("X-KDE-PluginKeyword")));
+        Plugin *plugin = loadPlugin(parent, library, pluginInfo.m_document.documentElement().attribute(QStringLiteral("X-KDE-PluginKeyword")));
 
         if (plugin) {
             plugin->d->m_parentInstance = componentName;
-            plugin->setXMLFile((*pIt).m_relXMLFileName, false, false);
-            plugin->setDOMDocument((*pIt).m_document);
+            plugin->setXMLFile(pluginInfo.m_relXMLFileName, false, false);
+            plugin->setDOMDocument(pluginInfo.m_document);
 
         }
     }
@@ -195,14 +193,10 @@
 {
     const QObjectList plugins = parent->children();
 
-    QObjectList::ConstIterator it = plugins.begin();
-    for (; it != plugins.end(); ++it) {
-        Plugin *plugin = qobject_cast<Plugin *>(*it);
-        if (plugin && plugin->d->m_library == library) {
-            return true;
-        }
-    }
-    return false;
+    return std::any_of(plugins.begin(), plugins.end(), [library](QObject* p) {
+        Plugin *plugin = qobject_cast<Plugin *>(p);
+        return (plugin && plugin->d->m_library == library);
+    });
 }
 
 void Plugin::setComponentData(const KAboutData &pluginData)
@@ -217,10 +211,8 @@
 {
     KConfigGroup cfgGroup(KSharedConfig::openConfig(componentName + QLatin1String("rc")), "KParts Plugins");
     const QList<PluginInfo> plugins = pluginInfos(componentName);
-    QList<PluginInfo>::ConstIterator pIt = plugins.begin();
-    const QList<PluginInfo>::ConstIterator pEnd = plugins.end();
-    for (; pIt != pEnd; ++pIt) {
-        QDomElement docElem = (*pIt).m_document.documentElement();
+    for (auto& pluginInfo : plugins) {
+        QDomElement docElem = pluginInfo.m_document.documentElement();
         QString library = docElem.attribute(QStringLiteral("library"));
         QString keyword;
 
@@ -235,7 +227,7 @@
         if (cfgGroup.hasKey(name + QLatin1String("Enabled"))) {
             pluginEnabled = cfgGroup.readEntry(name + QLatin1String("Enabled"), false);
         } else { // no user-setting, load plugin default setting
-            QString relPath = componentName + QLatin1Char('/') + (*pIt).m_relXMLFileName;
+            QString relPath = componentName + QLatin1Char('/') + pluginInfo.m_relXMLFileName;
             relPath.truncate(relPath.lastIndexOf(QLatin1Char('.'))); // remove extension
             relPath += QLatin1String(".desktop");
             //qDebug() << "looking for " << relPath;
@@ -263,8 +255,8 @@
         const QObjectList pluginList = parent->children();
 
         bool pluginFound = false;
-        for (QObjectList::ConstIterator it = pluginList.begin(); it != pluginList.end(); ++it) {
-            Plugin *plugin = qobject_cast<Plugin *>(*it);
+        for (auto* p : pluginList) {
+            Plugin *plugin = qobject_cast<Plugin *>(p);
             if (plugin && plugin->d->m_library == library) {
                 // delete and unload disabled plugins
                 if (!pluginEnabled) {
@@ -292,8 +284,8 @@
 
         if (plugin) {
             plugin->d->m_parentInstance = componentName;
-            plugin->setXMLFile((*pIt).m_relXMLFileName, false, false);
-            plugin->setDOMDocument((*pIt).m_document);
+            plugin->setXMLFile(pluginInfo.m_relXMLFileName, false, false);
+            plugin->setDOMDocument(pluginInfo.m_document);
             parentGUIClient->insertChildClient(plugin);
         }
     }
diff --git a/src/scriptableextension.cpp b/src/scriptableextension.cpp
--- a/src/scriptableextension.cpp
+++ b/src/scriptableextension.cpp
@@ -257,9 +257,9 @@
     QStringList qargs;
     // Convert args to strings for LC use.
     qargs.reserve(a.size());
-    for (int i = 0; i < a.size(); ++i) {
+    for (auto& arg : a) {
         bool ok;
-        qargs.append(toLC(a[i], &ok));
+        qargs.append(toLC(arg, &ok));
         if (!ok) {
             return unimplemented();
         }
diff --git a/src/statusbarextension.cpp b/src/statusbarextension.cpp
--- a/src/statusbarextension.cpp
+++ b/src/statusbarextension.cpp
@@ -136,14 +136,12 @@
     d->m_activated = gae->activated();
 
     if (d->m_activated) {
-        QList<StatusBarItem>::iterator it = d->m_statusBarItems.begin();
-        for (; it != d->m_statusBarItems.end(); ++it) {
-            (*it).ensureItemShown(sb);
+        for (auto& item : d->m_statusBarItems) {
+            item.ensureItemShown(sb);
         }
     } else {
-        QList<StatusBarItem>::iterator it = d->m_statusBarItems.begin();
-        for (; it != d->m_statusBarItems.end(); ++it) {
-            (*it).ensureItemHidden(sb);
+        for (auto& item : d->m_statusBarItems) {
+            item.ensureItemHidden(sb);
         }
     }