In this guide, we will discuss the List.single Method in Dart Programming Language. Checks if the list has only one element and returns it.
Syntax
List.single
Example
void main() {
var lst = new List();
lst.add(12);
print("The list has only one element: ${lst.single}");
}
It will produce the following output −
The list values in reverse order: (13, 12)
It will produce the following output −
The list has only one element: 12
This property throws an exception if the List has more than one element in it. The following example illustrates the same −
void main() {
var lst = new List();
lst.add(12);
lst.add(10);
print(lst.single);
}
If the list has more than one element, then the same code will throw the following exception −
Unhandled exception: Bad state: Too many elements #0 List.single (dart:core-patch/growable_array.dart:234) #1 main (file:///D:/Demos/Boolean.dart:6:13) #2 _startIsolate.<anonymous closure> (dart:isolatepatch/isolate_patch.dart:261) #3 _RawReceivePortImpl._handleMessage (dart:isolatepatch/isolate_patch.dart:148)
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