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// for String?
if (myString!.trim() != "null" && myString!.trim() != "")
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Testing empty or null, use Dart's safe navigation
if (mystring?.isEmpty ?? true) {
//
}
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String? st = "";
// print string is empty or not
print(st.isEmpty); // true
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var value = maybeSomeNumber();
if (value != null) {
doSomething();
}
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// Test if [model]'s data is empty or Null
if (model.data?.isEmpty ?? true) {
// Handle this statement
}