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Alex Rivera
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Say I have a function that checks whether some operation is applicable to an instance of A and, if so, returns an instance of B or None: def checker[A,B]( a: A ) : Option[B] = ... Now I want to form a new collection that contains all valid instances of B, dropping the None values. The following code seems to do the job, but there is certainly a better way: val as = List[A]( a1, a2, a3, ... ) val bs = as .map( (a) => checker(a) ) // List[A] => List[Option[B]] .filter( _.isDefined ) // List[Option[B]] => List[Option[B]] .map( _.get ) // List[Option[B]] => List[B]
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