js-number">1</span>], [<span class="hljs-string">'c'</span>, <span class="hljs-number">2</span>], [<span class="hljs-string">'d'</span>, <span class="hljs-number">3</span>], [<span class="hljs-string">'e'</span>, <span class="hljs-number">3</span>], [<span class="hljs-string">'f'</span>, <span class="hljs-number">3</span>]]);

<span class="hljs-comment">// will log true</span>
<span class="hljs-built_in">console</span>.log(map.has(<span class="hljs-string">'d'</span>));

<span class="hljs-comment">// will l