CODEWITHSUNDEEP
scala
Jacek Laskowski
Jacek Laskowski

Reputation: 74679

Idiomatic search of value in a list of element-value pairs in Scala

How to idiomaticaly search for an value in a list of (element, value) pairs in Scala?

Are there better (perhaps more succinct and/or efficient) ways than the following solution?

code.find(_._1 == 2).get._2

where code is of List[(Int, String)] type?

scala> val code: List[(Int, String)] = (0, "zero") :: (1, "one") :: (2, "two") :: Nil
code: List[(Int, String)] = List((0,zero), (1,one), (2,two))
scala> code.find(_._1 == 2).get._2
res0: String = two

Upvotes: 3

Views: 1256

Answers (2)

Tomasz Nurkiewicz
Tomasz Nurkiewicz

Reputation: 340763

What about pattern matching?

 code.collectFirst{ case(2, x) => x }

This yields Some(two) which you can further map/fold.

Upvotes: 11

Jatin
Jatin

Reputation: 31724

This will do:

scala> code.toMap
res17: scala.collection.immutable.Map[Int,String] = Map(0 -> zero, 1 -> one, 2 -> two)

scala> res17(0)
res18: String = zero

Upvotes: 0

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