code: @CheckReturnValue
      @BackpressureSupport(BackpressureKind.FULL)
      @SchedulerSupport(SchedulerSupport.NONE)
      public static <T> Flowable<T> fromArray(T... items) {
          ObjectHelper.requireNonNull(items, "items is null");
          if (items.length == 0) {
              return empty();
          }
          if (items.length == 1) {
              return just(items[0]);
          }
          return RxJavaPlugins.onAssembly(new FlowableFromArray<T>(items));
      }
docs: Converts an Array into a Publisher that emits the items in the Array.
  <p>
  <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.png" alt="">
  <dl>
  <dt><b>Backpressure:</b></dt>
  <dd>The operator honors backpressure from downstream and iterates the given {@code array}
  on demand (i.e., when requested).</dd>
  <dt><b>Scheduler:</b></dt>
  <dd>{@code fromArray} does not operate by default on a particular {@link Scheduler}.</dd>
  </dl>
  
  @param items
  the array of elements
  @param <T>
  the type of items in the Array and the type of items to be emitted by the resulting Publisher
  @return a Flowable that emits each item in the source Array
  @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>