Scala SortedMap filter() 方法示例
filter()方法用于选择 SortedMap 中满足指定谓词的所有元素。
Method Definition: def filter(p: ((A, B))=> Boolean): SortedMap[A, B]
Return Type: It returns a new SortedMap consisting all the elements of the SortedMap which satisfies the given predicate.
示例 #1:
// Scala program of filter()
// method
import scala.collection.immutable.SortedMap
// Creating object
object GfG
{
// Main method
def main(args:Array[String])
{
// Creating SortedMap
val m1 = SortedMap("geeks" -> 5, "for" -> 3)
// Applying filter method
val result = m1.filter(x => x._1 == "geeks" && x._2 == 5)
// Displays output
println(result)
}
}
输出:
Map(geeks -> 5)
示例 #2:
// Scala program of filter()
// method
import scala.collection.immutable.SortedMap
// Creating object
object GfG
{
// Main method
def main(args:Array[String])
{
// Creating SortedMap
val m1 = SortedMap("geeks" -> 5, "for" -> 3)
// Applying filter method
val result = m1.filter(x => x._1 == "for" && x._2 == 5)
// Displays output
println(result)
}
}
输出:
Map()
在这里,一个空的 SortedMap 被返回,因为没有一个元素满足所述谓词。