Scala reduceLeft
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scala> val a = Array(20, 12, 6, 15, 2, 9)a: Array[Int] = Array(20, 12, 6, 15, 2, 9)
1、a simple function:
scala> a.reduceLeft(_ + _)res0: Int = 64scala> a.reduceLeft(_ * _)res1: Int = 388800scala> a.reduceLeft(_ min _)res2: Int = 2scala> a.reduceLeft(_ max _)res3: Int = 202、Use a function
scala> val a = Array(20, 12, 6, 15, 2, 9)a: Array[Int] = Array(20, 12, 6, 15, 2, 9)scala> val f = (x:Int, y:Int) => x max yf: (Int, Int) => Int = <function2>scala> a.reduceLeft(f)res0: Int = 20
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