first property Null safety

TextTrackCue first

Returns the first element.

Throws a StateError if this is empty. Otherwise returns the first element in the iteration order, equivalent to this.elementAt(0).


TextTrackCue get first {
  if (this.length > 0) {
    return JS('TextTrackCue', '#[0]', this);
  throw new StateError("No elements");
void first=(TextTrackCue value)

The first element of the list.

The list must be non-empty when accessing its first element.

The first element of a list can be modified, unlike an Iterable. A list.first is equivalent to list[0], both for getting and setting the value.

final numbers = <int>[1, 2, 3];
print(numbers.first); // 1
numbers.first = 10;
print(numbers.first); // 10
numbers.first; // Throws.


void set first(E value) {
  if (length == 0) throw IterableElementError.noElement();
  this[0] = value;