description

# indexOf abstract method

int indexOf(

1. E element, [
2. int start = 0

])

The first index of `element` in this list.

Searches the list from index `start` to the end of the list. The first time an object `o` is encountered so that `o == element`, the index of `o` is returned.

    final notes = <String>['do', 're', 'mi', 're'];
    print(notes.indexOf('re')); // 1

    final indexWithStart = notes.indexOf('re', 2); // 3

Returns -1 if `element` is not found.

    final notes = <String>['do', 're', 'mi', 're'];
    final index = notes.indexOf('fa'); // -1

## Implementation

    int indexOf(E element, [int start = 0]);