Scala: foldLeft和foldRight 实战
scala源代码： def /:[B](z: B)(op: (B, A) => B): B = foldLeft(z)(op)
def :\[B](z: B)(op: (A, B) => B): B = foldRight(z)(op)
在scala命令行运行 scala> (0/:(1 to 100))(_+_) res0: Int = 5050
scala> ((1 to 100):\0)(_+_) res1: Int = 5050
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