description

# first property

TextTrack first
override

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)`.

## Implementation

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

void first= (TextTrack value)
inherited

Updates the first position of the list to contain `value`.

Equivalent to `theList[0] = value;`.

The list must be non-empty.

## Implementation

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