description

# lastWhere method

E lastWhere(

1. bool test(
   1. E element
   ), {
2. E orElse()?,

})
override

The last element that satisfies the given predicate `test`.

An iterable that can access its elements directly may check its elements in any order (for example a list starts by checking the last element and then moves towards the start of the list). The default implementation iterates elements in iteration order, checks `test(element)` for each, and finally returns that last one that matched.

Example:

    final numbers = <int>[1, 2, 3, 5, 6, 7];
    var result = numbers.lastWhere((element) => element < 5); // 3
    result = numbers.lastWhere((element) => element > 5); // 7
    result = numbers.lastWhere((element) => element > 10,
        orElse: () => -1); // -1

If no element satisfies `test`, the result of invoking the `orElse` function is returned. If `orElse` is omitted, it defaults to throwing a StateError.

## Implementation

    E lastWhere(bool test(E element), {E Function()? orElse}) {
      int length = this.length;
      for (int i = length - 1; i >= 0; i--) {
        E element = this[i];
        if (test(element)) return element;
        if (length != this.length) {
          throw ConcurrentModificationError(this);
        }
      }
      if (orElse != null) return orElse();
      throw IterableElementError.noElement();
    }