Returns the first index in the list that satisfies the provided test
.
Searches the list from index start
to the end of the list. 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.indexWhere((note) => note.startsWith('r')); // 1 notes.indexWhere((note) => note.startsWith('r'), 2); // 3
Returns -1 if element
is not found.
notes.indexWhere((note) => note.startsWith('k')); // -1
int indexWhere(bool test(E element), [int start = 0]) { if (start < 0) start = 0; for (int i = start; i < this.length; i++) { if (test(this[i])) return i; } return -1; }
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-collection/ListMixin/indexWhere.html