yield keyword will returns a result after completing of loop iterations. … The type of the collection that is returned is the same type that we tend to were iterating over, Therefore a Map yields a Map, a List yields a List, and so on.

What is yield in spark?

Yield is used in sequence comprehensions. It is applied in combination with for-loop and writes a new element into the resulting sequence. Scala’s for-loop comprehensions are syntactic for the composition of multiple operations with map, flatMap, and filter. Or foreach.

Is the scope separate between for body and yield body?

For the for-yield construct, is the scope separate between for-body and yield-body? Yes and no. It is different depending on the for construct and what it does. Yes, because the for section does not expose its scope.