I needed a destructive append to a JS array, so I wrote this version of NCONC for PS. It&#39;s primitive, but does what I need.<br><br>(defun nconc (arr &amp;rest arrs)<br>    (when (and arr (&gt; (length arr) 0))<br>      (loop :for other :in arrs :when (and other (&gt; (length other) 0)) :do<br>

        ((@ arr :splice :apply) arr<br>         (append (list (length arr) (length other)) other))))<br>    arr)<br><br>I suppose this would naturally go in some kind of runtime library for PS. (We have quite a few utility functions that might belong there, in fact.) But I don&#39;t think there is one anymore. Should there be?<br>

<br>Daniel<br>