t.dev/null-safety" class="feature feature-null-safety" title="Supports the null safety language feature.">Null safety</a>
 
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    <section class="multi-line-signature">
        

<span class="returntype"><a href="https://api.dart.dev/stable/2.13.4/dart-core/bool-class.html">bool</a></span>
<span class="name ">isUpperCase</span>(<wbr><ol class="parameter-list"><li><span class="parameter" id="isUpperCase-param-input"><span class="type-annotation"><a href="https://api.dart.dev/stable/2.13.4/dart-cor