nsertion order, do:<ol><li>If <var>e</var>.<var class="field">[[Key]]</var> is not <emu-const>empty</emu-const>, then<ol><li>Let <var>same</var> be the result of performing Strict Equality Comparison <var>searchElement</var> === <var>e</var>.<var class="field">[[Value]]</var>.</li><li>If <var>same</var> is <emu-val>true</emu-val>, then return <var>e</var>.<var class="field">[[Key]]</var>.</li></ol></li></ol></li><li>Return <emu-val>undefined</emu-val>.

</li></ol></emu-alg></emu-import>
        </emu-clause