rectest/scripts/set/SetFactory.js

/**
 * Returns the requesetd type of set
 */
rectest.set.SetFactory = Class( 'SetFactory',
{
    'public fromId': function( id, base_set, sample_size )
    {
        var sets = rectest.set;

        return [
            null,
            sets.RandomGroupedSet,
            null,
            null
        ][ id ]( base_set, sample_size );
    }
} );