如何在Scala中从数组中获取特定值的极限

Question

我有一个阵列

val bins = Array(0,100, 250, 500, 1000, 2000, 3000) 这是我的代码：

private var cumulativeDelay:Map[String ,Double] = linkIds.zip(freeFlowDelay).groupBy(_._1).mapValues(l => l.map(_._2).sum)
private var cumulativeCapacity:Map[String , Double] = linkIds.zip(linkCapacity).groupBy(_._1).mapValues(l => l.map(_._2).sum)
cumulativeCapacity foreach {
case(linkId , capacity) => {
val rangeToValue = bins.zip(bins.tail)
.collectFirst { case (left, right) if capacity >= left && capacity <= right =>
Map(s"$left-$right" -> cumulativeDelay.get(linkId))
}
.getOrElse(Map.empty[String, Double])
}
}

所以rangeToValue的值就像Map(1000-2000->Some(625((，但我想要rangeToValue:Map[String，Double]=(1000-2000->625(

Answer 1

您应该尝试这样的方法，但它不适用于超出范围的值：

val bins = Array(0, 100, 250, 500, 1000, 2000, 3000)
val effectiveValue = 625
val rangeToValue = bins.zip(bins.tail)
.collectFirst { case (left, right) if effectiveValue >= left && effectiveValue <= right =>
Map(s"$left-$right" -> effectiveValue)
}
.getOrElse(Map.empty[String, Int])
rangeToValue("500-1000")