prefer-first-or-null

added in: 1.2.0 style

Warns when the first element of an Iterable or a List is accessed by first, list[0] or iterable.elementAt(0) instead of calling iterable.firstOrNull.

Example

Bad:

...
const array = [1, 2, 3, 4, 5, 6, 7, 8, 9];

array.elementAt(0); // LINT
array[0]; // LINT

Good:

const array = [1, 2, 3, 4, 5, 6, 7, 8, 9];

array.firstOrNull;