Added function to filter object keys

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "foris",
-  "version": "0.1.0-beta.3",
+  "version": "0.1.0-beta.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "foris",
-  "version": "0.1.0-beta.3",
+  "version": "0.1.0-beta.4",
   "description": "Set of components and utils for Foris and its plugins.",
   "author": "CZ.NIC, z.s.p.o.",
   "repository": {

src/utils/objectHelpers.js

@@ -18,3 +18,11 @@ export function withoutUndefinedKeys(instance) {
         {},
     );
 }
+
+/** Return copy of passed object that has only desired keys. */
+export function onlySpecifiedKeys(object, desiredKeys) {
+    return desiredKeys.reduce(
+        (accumulator, key) => { accumulator[key] = object[key]; return accumulator; },
+        {},
+    );
+}