CoachGroup={
create: function(){var o=Object.create(this); o.playerList=[]; return o},
addPlayer: function(name){this.playerList.push(name)},
showPlayers: function(){alert(this.playerList)}
}
group=CoachGroup.create()
group.addPlayer("Mike")
group.addPlayer("Kate")
group.addPlayer("Jane")
group.showPlayers() // [ 'Mike', 'Kate', 'Jane' ]