scala的reduceRight操做?

怎樣理解以下的結果?html

scala> val list = List(1,2,3,4,5)api

scala> list.reduceRight(_ - _)ide

res26: Int = 3this


執行過程以下:
scala

(1 - ( 2 - ( 3 - ( 4 - 5 ))))htm


官方文檔說明:element

op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))
文檔

where x1, ..., xn are the elements of this mutable indexed sequence.it


文檔地址:table

https://www.scala-lang.org/api/current/scala/Array.html#reduceRight[B>:A](op:(A,B)=>B):B

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