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lastIndexWhere method

int lastIndexWhere (bool test(E element), [ int start ])
override

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

Implementation

int lastIndexWhere(bool test(E element), [int start]) {
  if (start == null || start >= this.length) start = this.length - 1;
  for (int i = start; i >= 0; 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/lastIndexWhere.html