n&lt;Tuple&lt;BankersDeque&lt;a&gt;, a&gt;&gt;</span> <strong>tryUnsnoc&lt;a&gt;</strong>(<a href="../FSharpx.DataStructures/BankersDeque`1.htm">BankersDeque&lt;a&gt;</a> q)</h4>
		<div class="content">O(1), amortized. Returns option init and the last element. 



      
    </div>
	</div>
	<div id="tryUpdate``1" class="method">
		<h4><span title="Microsoft.FSharp.Core.FSharpOption<BankersDeque<a>>">FSharpOption&lt;BankersDeque&lt;a&gt;&gt;</span> <strong>tryUpdate&lt;a&gt;</strong>(<span title="System.int"