本文主要是介绍scala reduce 图解，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

文章目录

• scala reduce 集合操作图解

scala reduce 集合操作图解

// Scala program to
// print maximum value
// using reduce()
 
// Creating object
object GfG
{
     
// Main method
def main(args:Array[String])
{
    // source collection
    val collection = List(1, 3, 2, 5, 4, 7, 6)
 
    // finding the maximum valued element
    val res = collection.reduce((x, y) => x max y)
 
    println(res)
    //  7 
}
}

// Scala program to
// print average
// using map() and reduce()
 
//Creating object
object GfG
{
     
// Main method
def main(args:Array[String])
{
    // source collection
    val collection = List(1, 5, 7, 8)
 
    // converting every element to a pair of the form (x,1)
    // 1 is initial frequency of all elements
    val new_collection = collection.map(x => (x,1))
 
    /*
    List((1, 1), (5, 1), (7, 1), (8, 1))
    */
 
    // adding elements at corresponding positions
    val res = new_collection.reduce( (a,b) => ( a._1 + b._1,
                                            a._2 + b._2 ) )
    /*
    (21, 4)
    */
 
    println(res)
    println("Average="+ res._1/res._2.toFloat)
}
}

这篇关于scala reduce 图解的文章就介绍到这儿，希望我们推荐的文章对大家有所帮助，也希望大家多多支持为之网！