3053;&#x3068;&#x306B;&#x6C17;&#x3065;&#x304D;&#x307E;&#x3057;&#x305F;&#x304B;&#xFF1F;</p>
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In JavaScript, the equivalent code spits out `"undefined Hesse"`. Not even an error! Hopefully one of your users will tell you about it when they see it in the wild. In contrast, the Elm compiler just looks at the source code and tells you:
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<p>JavaScript &#x3067;&#x540C;&#x7B49;&#x306E;&#x30B3;&#x30FC;&#x30C9;&#x306F;<code>&quot;undefined Hesse&quot;</code>&#x3092;&#x5410;&#x304D;&#x51FA;&#x3057;&#x307E;&#x305