Returns the last index in the list that satisfies the provided test.
Searches the list from index start to 0. The first time an object o is encountered so that test(o) is true, the index of o is returned.
List<String> notes = ['do', 're', 'mi', 're'];
notes.lastIndexWhere((note) => note.startsWith('r')); // 3
notes.lastIndexWhere((note) => note.startsWith('r'), 2); // 1 Returns -1 if element is not found.
notes.lastIndexWhere((note) => note.startsWith('k')); // -1 int lastIndexWhere(bool test(E element), [int start]);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-core/List/lastIndexWhere.html