<span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">)</span></h5><div class="tsd-comment tsd-typography"><p>The argument to the predicate will be an <a href="IKeyValuePair.html" class="tsd-kind-interface">IKeyValuePair</a>.
This function must not have any side-effects.</p>
</div><ul class="tsd-parameters"><li class="tsd-parameter-signature"><ul class="tsd-signatures"><li class="tsd-signature"><span class="tsd-signature-symbol">(<