Checking values in lists with Scala

Question

I have a check(a, b, c) method that checks if a is in range between b and c (a >= b && a <= c). For a given lists, for example, v = List(1,2) and r = List((3,4),(5,6)); I'd like to check if all values r is in ranges from r using the check method: check(1, 3, 4) && check (2, 5, 6).

I have high level solution as follows, but I have some missing parts.

val x = v zip r // (Int, (Int, Int)) 
val y = ???     // (Int, (Int, Int)) => (Int, Int, Int)
(y map check).forall {_ == true} // error

How can I get the solution?

Kigyo · Accepted Answer · 2014-08-14 19:38:03Z

5

How about just directly calling forall?

(v zip r).forall{case (a,(b,c)) => check(a,b,c)}

One way to make your approach work (I would not recommend it though).

val x = v zip r
val y = x map {case (a,(b,c)) => (a,b,c)}
val tupledCheck = (check _).tupled

//Some alternatives for the result
(y map tupledCheck).forall(_ == true)
(y map tupledCheck).forall(identity)
y forall tupledCheck

edited Aug 14, 2014 at 19:38

answered Aug 14, 2014 at 18:59

Kigyo

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