ay is good for doing pre and post initializations.
            </li>
<li class="listitem">
              The expression <code class="computeroutput"><span class="identifier">a</span> <span class="special">||</span>
              <span class="identifier">b</span></code> reads: match a or b and
              in sequence. That is, if both <code class="computeroutput"><span class="identifier">a</span></code>
              and <code class="computeroutput"><span class="identifier">b</span></code> match, it must
 