acl-js/src-js/track_array.js
// Returns the track at the specified index.
Returns the track at the specified index.
Returns the track at the specified index .
at(trackIndex) {
    if (trackIndex < 0 || trackIndex >= this._numTracks) {
      throw new RangeError('Invalid track index');
    }
    return this._tracks[trackIndex]
  }
at ( trackIndex ) { if ( trackIndex < 0 || trackIndex >= this . _numTracks ) { throw new RangeError ( 'Invalid track index' ) ; } return this . _tracks [ trackIndex ] }
Returns the track at the specified index.
Returns the track at the specified index .