Function unique

Returns true if all the entities are distinct by the property value argument.

Example

 let todos: Todo[] = [
   { id: 1, title: "Lets do it!" },
   { id: 1, title: "Lets do it again!" },
   { id: 2, title: "All done!" }
 ];

 let todos2: Todo[] = [
   { id: 1, title: "Lets do it!" },
   { id: 2, title: "All done!" }
 ];

 expect(unique(todos, "id")).toBeFalsy();
 expect(unique(todos2, "id")).toBeTruthy();
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