/span><span class="token punctuation">)</span><span class="token operator">: </span><a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html">Boolean</a><span class="clearfix"><span class="floating-right">(<a href="https://github.com/jeffdgr8/kotbase/tree/main/couchbase-lite-ee/src/commonMain/kotlin/kotbase/Document.kt#L206">source</a>)</span></span></div><p class="paragraph">Tests whether a property exists or not. This can be less expensive than getValue(String), because it does not