zilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number">Number</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">A 0 based index which should be between 0 and list.size (exclusive). If the index is out of this range, then undefined will be returned. </div></div></div></div></div></div><div class="qm-api-group qm-api-returns-group