Dart/Flutter List.isNotEmpty() is incorrect?

I'm trying to access a list, but only if it isn't empty. After receiving some odd pathing, I discovered that the List.isNotEmpty is returning a length of 0, and it is not empty. Unless, of course, what I consider "empty" is in the wrong mindset?

Here's the test I ran, where I created an "empty" list. Then, I tested to see what came back when I tested isNotEmpty.

List<String> myKeywords = [];
if(myKeywords.isNotEmpty){
  print("Keywords is not empty..?");
  print("Keywords length = ${myKeywords.length}");
  print("Keyword: \"${myKeywords.first}\"");
}

// output

Keywords is not empty..?
Keywords length = 0
// Error: Bad state: No element

This doesn't work the same way with strings:

String myString = "";
if(myString.isNotEmpty){
  print("myString is not empty..?");
  print("myString length = ${myString.length}");
}
else{
  print("myString is empty");
}

Output:

myString is empty

Looking at documentation, List.isNotEmpty states the following:

Whether this collection has at least one element.
May be computed by checking if iterator.moveNext() returns true.
Example:
final numbers =  {1, 2, 3};
print(numbers.isNotEmpty); // true;
print(numbers.iterator.moveNext()); // true

Can someone explain this to me? Or, perhaps this is a bug?

Android Studio
Dart SDK Version - 2.19.4 (Stable)
Flutter Version - 3.7.7 (Stable)

Thank you!

It is actually working as expected. Try debugging your program, because the output stated above is incorrect

Make sure you have not added any element between isNotEmpty and initialization.

The output of the following code would be:

List<String> myKeywords = [];
if (myKeywords.isNotEmpty){
  print("Keywords is not empty..?");
  print("Keywords length = ${myKeywords.length}");
  print("Keyword: \"${myKeywords.first}\"");
} else {
  print("Keywords is empty");
}

The following code should return Keywords is empty.

Check this DartPad link.

I think there are some issues with Flutter. I tested it in DartPad and it works fine.

Here is the DartPad link.

I suggest you open an issue in the Flutter repository on Github.