⚠️ INFORMATION: SAFETY & SUPPORT
Resources here are generally safe, but false positives may occur on Virustotal due to certain coding techniques. Exercise caution and test before use.
Your calculator likely displays "undefined" when deleting the last character because of how your code is handling the input string or expression. When the input becomes empty (e.g., after deleting all characters), the expression is no longer valid, and the result of evaluating it is undefined...
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