Shim Array methods added after current Qt version in Ubuntu

qml/ArrowKeysSelecter.qml

@@ -16,7 +16,7 @@ Item {
     Keys.onUpPressed: goUp()
 
     function findSelectedIndex() {
-        return credentials.findIndex(function(entry) {
+        return util.findIndex(credentials, function(entry) {
             return entry.credential.key === selectedKey
         }) || null
     }

qml/Util.qml

@@ -0,0 +1,44 @@
+import QtQuick 2.5
+
+Item {
+    visible: false
+
+    /*
+     * Quick and dirty shim for Array.find added in Qt 5.9
+     *
+     * @param items: array
+     * @param predicate: function(any) => Boolean
+     * @return The first `item` in `arr` that matches the `predicate`, or
+     *          `undefined` if none matches
+     */
+    function find(items, predicate) {
+        if (items) {
+            for (var i = 0; i < items.length; ++i) {
+                if (predicate(items[i])) {
+                    return items[i]
+                }
+            }
+        }
+        return undefined
+    }
+
+    /*
+     * Quick and dirty shim for Array.findIndex added in Qt 5.9
+     *
+     * @param items: array
+     * @param predicate: function(any) => Boolean
+     * @return The index of the first `item` in `arr` that matches the
+     *          `predicate`, or `undefined` if none matches
+     */
+    function findIndex(items, predicate) {
+        if (items) {
+            for (var i = 0; i < items.length; ++i) {
+                if (predicate(items[i])) {
+                    return i
+                }
+            }
+        }
+        return undefined
+    }
+
+}

qml/main.qml

@@ -371,6 +371,10 @@ ApplicationWindow {
         id: noQr
     }
 
+    Util {
+        id: util
+    }
+
     function selectCredential(entry) {
         selectedKey = entry.credential.key
     }
@@ -380,7 +384,7 @@ ApplicationWindow {
     }
 
     function getSelected() {
-        return credentials.find(function(entry) {
+        return util.find(credentials, function(entry) {
             return isSelected(entry.credential)
         }) || null
     }