CODEWITHSUNDEEP
listscalafilter
Vandexel
Vandexel

Reputation: 639

Using scala's filter on a list of pairs

I am trying to filter a list that contains pairs.

For example my list is

List((1,2),(3,4),(5,2))

I want to use filter to filter the list to only contain answers where the first number in the pair is greater than the second. How can I do this?

So, The resulting list would be

List((5,2))

Upvotes: 0

Views: 1727

Answers (2)

Lomig Mégard
Lomig Mégard

Reputation: 1828

Your example doesn't make sense, but I guess you still want to filter your list on some predicate.

The easier is to deconstruct the pair:

scala> val l = List((1,2), (3,4), (4,5))
l: List[(Int, Int)] = List((1,2), (3,4), (4,5))
scala> l.filter { case (a, b) => a > b }
res0: List[(Int, Int)] = List()

Upvotes: 4

Samar
Samar

Reputation: 2101

Filter for first number in pair is greater than second:

val ls = List((1,2),(3,4),(4,5),(6,2)) 
ls.filter(pair => pair._1 > pair._2) // List((6, 2))

Upvotes: 4

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