swift - Good programming style with optionals -

i want read enum parameter nsuserdefaults. in case there nothing set in userdefaults want default value. there better way (more elegant) did here "if let" statement? , singleton want access value in other parts of code using

if gamestate.learnlevel == level.low {..}

how that?

class gamestate {  var learnlevel:level enum level:int {    case low = 1,medium,high }  class var sharedinstance: gamestate {     return _somemanagersharedinstance }  init(){      // load games state     let learnlevel = level(rawvalue: nsuserdefaults.standarduserdefaults().integerforkey("learnlevel"))      if let learnlevel1 = learnlevel {self.learnlevel = learnlevel1} else {self.learnlevel = level.low}  } 

use nil coalescing operator ??:

    let learnlevel = level(rawvalue: nsuserdefaults.standarduserdefaults().integerforkey("learnlevel"))             self.learnlevel = learnlevel ?? level.low