Function distinct

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

Note that the implementation uses a Map<string, E> to index the entities by key. Therefore the more recent occurences matching a key instance will overwrite the previous ones.

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(distinct(todos, "id").length).toEqual(2);
 expect(distinct(todos2, "id").length).toEqual(2);

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