Talk:Sum and product puzzle

Remove draft status?

Now that I improved the task description, is this task ready for prime time? --Smls (talk) 14:47, 5 August 2016 (UTC)

I went ahead and took it out of draft status. --Smls (talk) 12:35, 20 August 2016 (UTC)

Scala

Could someone in the know please explain these two lines in plain English?

val step2 = step0 filter { sumEq(_) forall { prodEq(_).size != 1 }}

  step2 contains the pairs whose product is unique and ??
 

val step3 = step2 filter { prodEq(_).intersect(step2).size == 1 }