p</span>(<span class="hljs-variable language_">this</span>), <span class="hljs-string">'this is not a Map instance'</span>);
    <span class="hljs-keyword">const</span> isPresentInMap = <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">has</span>(key);
    <span class="hljs-keyword">if</span> (isPresentInMap === <span class="hljs-literal">false</span> &amp;&amp; <span class="hljs-variable language_">arguments</span>.<span class="hljs-property">length</span> &lt; <span clas