ref="https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean">Boolean</a></span></span></span><span class="qm-api-header-tags"></span></div></div></div></div><div class="qm-api-collapsible-content"><div class="qm-api-item-content"><div class="qm-api-description"><div class="qm-html-paragraph">Checks if the list contains a value. Returns true if the value is in the list, false otherwise. </div></div><div class="qm-api-group qm-api-arg-group"><div class="qm-api-group-header qm-api-a