quence is exhausted, the last value returned from the
closure is returned to the caller.</li></ol>

<p><strong>Parameters:</strong>
  <strong>initialResult:</strong> the initial accumulating value.
  <strong>nextPartialResult:</strong> A closure that combines an accumulating
    value and an element of the sequence into a new accumulating
    value, to be used in the next call of the
    <code>nextPartialResult</code> closure or returned to the caller.
<strong>Returns:</strong> The final accumulated value.<