fix(striker-ui-api): replace empty function with call in join

striker-ui-api/src/lib/join.ts

@@ -2,29 +2,25 @@ import call from './call';
 
 const join: JoinFunction = (
   elements,
-  {
-    beforeReturn,
-    elementWrapper = '',
-    onEach = (element: string) => element,
-    separator = '',
-  } = {},
+  { beforeReturn, elementWrapper = '', onEach, separator = '' } = {},
 ) => {
   const joinSeparator = `${elementWrapper}${separator}${elementWrapper}`;
 
   const toReturn =
     elements instanceof Array && elements.length > 0
-      ? `${elementWrapper}${elements
-          .slice(1)
-          .reduce<string>(
-            (previous, element) =>
-              `${previous}${joinSeparator}${onEach(element)}`,
-            elements[0],
-          )}${elementWrapper}`
+      ? `${elementWrapper}${elements.slice(1).reduce<string>(
+          (previous, element) =>
+            `${previous}${joinSeparator}${call<string>(onEach, {
+              notCallableReturn: element,
+              parameters: [element],
+            })}`,
+          elements[0],
+        )}${elementWrapper}`
       : undefined;
 
   return call<string | undefined>(beforeReturn, {
-    parameters: [toReturn],
     notCallableReturn: toReturn,
+    parameters: [toReturn],
   });
 };