val a = Array(20, 12, 6, 15, 2, 9)
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scala> a.reduceLeft(_ + _) // 数组求和res0: Int = 64scala> a.reduceLeft(_ * _) // 数组求乘积res1: Int = 388800scala> a.reduceLeft(_ min _) // 数组求最小值res2: Int = 2scala> a.reduceLeft(_ max _) // 数组求最大值res3: Int = 20 |
自定义函数实现数组求最大值功能
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scala> val a = Array(20, 12, 6, 15, 2, 9)scala> val f = (x:Int, y:Int) => x max yscala> a.reduceLeft(f)res0: Int = 20 |
第一、第二个数的比较结果再与第三个数进行比较，以此类推。x为上一次结果，y为本次比较数值
scala> val a = Array(20, 12, 6, 15, 2, 9)
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scala> a.reduceLeft(_ + _) // 数组求和res0: Int = 64scala> a.reduceLeft(_ * _) // 数组求乘积res1: Int = 388800scala> a.reduceLeft(_ min _) // 数组求最小值res2: Int = 2scala> a.reduceLeft(_ max _) // 数组求最大值res3: Int = 20 |
自定义函数实现数组求最大值功能
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1
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3
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scala> val a = Array(20, 12, 6, 15, 2, 9)scala> val f = (x:Int, y:Int) => x max yscala> a.reduceLeft(f)res0: Int = 20 |
第一、第二个数的比较结果再与第三个数进行比较，以此类推。x为上一次结果，y为本次比较数值
原文：https://www.cnblogs.com/DianaChen/p/10452121.html