an class="token punctuation">;</span>
<span class="token comment">//=> TypeError: Object Oahu,Kauai has no method 'contains'</span>

<span class="token comment">// Convert `islands` to an array that implements the</span>
<span class="token comment">// Ember enumerable and array interfaces</span>
Ember<span class="token punctuation">.</span><span class="token constant">A</span><span class="token punctuation">(</span>islands<span class="token punctuation">)</span><span class="token punctuation">;</span>

isla