ar>&nbsp;} <var>e</var> that is an element of <var>entries</var>, in original key insertion order, do:<ol><li>If <var>e</var>.<var class="field">[[Key]]</var> is not <emu-const>empty</emu-const>, then<ol><li>If <var>first</var> be <emu-val>true</emu-val> and <var>initialValue</var> is not present:<ol><li>Set <var>accumulator</var> to <var>e</var>.<var class="field">[[Value]]</var></li></ol></li><li>Else,<ol><li>Set <var>accumulator</var> to ?&nbsp;Call(<var>callbackfn</var>, undefined, « <var>accumulator</