code: static <K, V1, V2> EntryTransformer<K, V1, V2> asEntryTransformer(
        final Function<? super V1, V2> function) {
      checkNotNull(function);
      return new EntryTransformer<K, V1, V2>() {
        @Override
        public V2 transformEntry(K key, V1 value) {
          return function.apply(value);
        }
      };
    }
docs: Views a function as an entry transformer that ignores the entry key.