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flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow
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flutter - Error: A value of type 'String?' can't be assigned to a variable of type 'String' - Stack Overflow
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Dart String to Int: How you turn a string into a number (or vice versa) with Dart - DEV Community 👩💻👨💻
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flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow
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The argument type 'String?' can't be assigned to the parameter type 'String'. · Issue #92792 · flutter/flutter · GitHub
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