nchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>data frame</p>
    <h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

    <p>Curriculum without this information will return NULL.</p>

    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'><span class='kw'>if</span>(<span class='fu'><a href='https://rdrr.io/r/base/interactive.html'>interactive</a></span>()){
 <span c