from the features we have discussed already, sometimes we might want to use the update by reference feature for its side effect. And at other times it may not be desirable to modify the original object, in which case we can use <code>copy()</code> function, as we will see in a moment.</p>
<div id="a-for-its-side-effect" class="section level3">
<h3>a) <code>:=</code> for its side effect</h3>
<p>Let’s say we would like to create a function that would return the <em>maximum speed</em> for each month. But at 