scala - Why doesn't Option have a fold method? -

I wonder why scala.option has no way fold defined as:

  fold (IfSome: A => B, ifNone: = & gt; B)   
 equals  Map (ifSome) .getOrElse (ifNone)   
 What  map  +  getOrElse ?   
 
 
 You can do this:  
  opt foldLeft (els) (X, y) => funny (x))   
 or  
  (ELS /: OPT) ((x, y) = > Fun (X))   
  (Both will evaluate the solution value   els  ), which may be What do you want To indicate this.)   
  Edit:   
 But what exactly do you want Scalazâ € ™ s  cata  (basically a  fold  which handles not only  some  values, but also does not map to  any  part       (Some: A => X, None: => X): X = Value Match {Case No => Any case is anything (a) => Some (A)}   
 which is equal to  opt.map (some) .getOrElse (none) .  
 However, I should comment that you should use only CAT when it is more natural ???? The way to express it is like many cases where a simple  map  â  getOrElse  is sufficient, especially when there are many  maps  (though You can sort the  fun  s with the function structure, of course, it depends on whether you want to focus on the function structure or value change.)