language-js"><span class="hl-2">  </span><span class="hl-1">const</span><span class="hl-2"> </span><span class="hl-3">map</span><span class="hl-2"> = </span><span class="hl-1">new</span><span class="hl-2"> </span><span class="hl-4">go</span><span class="hl-2">.</span><span class="hl-5">Map</span><span class="hl-2">(); </span><span class="hl-0">// In TypeScript: new go.Map&lt;string, number&gt;();</span><br/><span class="hl-2">  </span><span class="hl-4">map</span><span class="hl-2">.</span><span class="hl-5