Pastable version of Get the last key

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            <pre class="sunburst"><span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">//</span>creation and affectation</span>
myArray<span style="color:#E28964;">=</span> <span style="color:#E28964;">new</span> <span style="text-decoration:underline;">Array</span>();
myArray[<span style="color:#3387CC;">2</span>]<span style="color:#E28964;">=</span><span style="color:#65B042;"><span style="color:#65B042;">'</span>something<span style="color:#65B042;">'</span></span>;
myArray[<span style="color:#3387CC;">7</span>]<span style="color:#E28964;">=</span><span style="color:#65B042;"><span style="color:#65B042;">'</span>somthingelse<span style="color:#65B042;">'</span></span>;
myArray[<span style="color:#3387CC;">99</span>]<span style="color:#E28964;">=</span><span style="color:#65B042;"><span style="color:#65B042;">'</span>thelastone<span style="color:#65B042;">'</span></span>;

<span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">//</span>my current function</span>
<span style="color:#99CF50;">function</span> <span style="color:#89BDFF;">getLastKey</span>(<span style="color:#3E87E3;">var a</span>){
    <span style="color:#E28964;">for</span>(<span style="color:#99CF50;">var</span> key <span style="color:#E28964;">in</span> a){}
    <span style="color:#E28964;">return</span> key;
}
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