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Scala 笔记

  • Scala版本

Scala 算子笔记

foldLeft

  • foldLeft 第一个参数作为第一个元素
  • (+) 函数是用于从第一个元素开始,两两进行计算(从左到右)
  • 结果为 2 + 1 +6 = 3 + 6 =9
scala> Seq(1,6).foldLeft(2)(_+_)
res11: Int = 9
  • foldRight 第一个参数作为第一个元素
  • (+) 函数是用于从第一个元素开始,两两进行计算(从右到左)
  • 结果为 2 +6 +1 = 8 +1 =9
scala> Seq(1,6).foldRight(2)(_+_)
res11: Int = 9

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