Adds id function

Author: JWittmeyer

id-prep.ts

@@ -0,0 +1,24 @@
+
+class IdGenerator {
+    private static id: number = 0;
+    public static getNextId() {
+        return ++IdGenerator.id;
+    }
+}
+
+export function extendArrayElementsByUniqueId(arr: any[]): any[] {
+    if (!arr || arr.length == 0) return [];
+    const firstElement = arr[0];
+
+    if (typeof firstElement === 'object') {
+        arr.forEach((element: any) => {
+            if (!element.id) {
+                element.id = IdGenerator.getNextId();
+            }
+        });
+        return arr;
+    } else {
+        return arr.map((element: any) => { return { value: element, id: IdGenerator.getNextId() } });
+    }
+
+}