CODEWITHSUNDEEP
javalistscala
Phani
Phani

Reputation: 81

Scala accessing list objects and evaluating them

Scala accessing list objects and evaluating them

I have list 

val example = List(ItemDesc(6164,6165,6166,6195,The values are correct), ItemDesc(14879,14879,14879,14894,The values are ok), ItemDesc(19682,19690,19682,19694,The values are good))

From the example List, I want to access object 'ItemDesc'. And get the even count and odd count.

For example, taking the first object in the list

ItemDesc(6164,6165,6165,6195,The values are correct)

I want to find out,

evenPlacesCount = 6164+6166

oddPlacesCount = 6165+6195

I have the code to evaluate if it is a plain List(6164,6165,6166,6195,The values are correct).

But how compute if I have List objects like 'example' above ?

Upvotes: 2

Views: 56

Answers (1)

slouc
slouc

Reputation: 9698

Something like this?

case class ItemDesc(a: Int, b: Int, c: Int, d: Int, desc: String)
case class Pair(even: Int, odd: Int)

val example = List(
  ItemDesc(6164, 6165, 6166, 6195, "The values are correct"),
  ItemDesc(14879, 14879, 14879, 14894, "The values are ok"),
  ItemDesc(19682, 19690, 19682, 19694, "The values are good")
)

def evenOddCount(item: ItemDesc): Pair = Pair(item.a + item.c, item.b + item.d)
def addEvenOddCounts(first: Pair, second: Pair): Pair = Pair((first.even + second.even), (first.odd + second.odd))

val evenOddPair = evenOddCount(ItemDesc(6164, 6165, 6166, 6195, "The values are correct")) // Pair(12330,12360)
val allPairs = example.map(evenOddCount) // List(Pair(12330,12360), Pair(29758,29773), Pair(39364,39384))
val totalPair = example.map(evenOddCount).reduce(addEvenOddCounts) // Pair(81452,81517)

Upvotes: 2

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