r by using code that handles
both defined and undefined <code>filters</code> arrays.</p>
<p>To modify an existing filter object, you must use the technique of
modifying a copy of the <code>filters</code> array:</p><ol><li>Assign the value of the <code>filters</code> array to a temporary
array, such as one named <code>myFilters</code>.</li><li>Modify the property by using the temporary array,
<code>myFilters</code>. For example, to set the quality property of the
first filter in the array, you could use the 