package main type Color int const ( Gray Color = iota Black Blue Red Yellow Green White Magenta ) func (c Color) String() string { switch c { case Gray: return "gray" case Black: return "black" case Blue: return "blue" case Red: return "red" case Yellow: return "yellow" case Green: return "green" case White: return "white" case Magenta: return "magenta" } return "gray" }