Scala for-comprehension语法

Question

在下面的代码中,在for理解中,我可以使用元组取消引用来引用字符串和索引:

val strings = List("a", "b", "c")
for (stringWithIndex <- strings.zipWithIndex) {
  // Do something with stringWithIndex._1 (string) and stringWithIndex._2 (index)
}

有没有在斯卡拉语法的方式有stringWithIndex拆分成零件(串和索引)的范围内for理解头,使代码的读者不必在值怀疑stringWithIndex._1和stringWithIndex._2？

我尝试了以下,但它不会编译:

for (case (string, index) <- strings.zipWithIndex) {
  // Do something with string and index
}

Answer 1

你几乎得到了它:

scala> val strings = List("a", "b", "c")
strings: List[java.lang.String] = List(a, b, c)

scala> for ( (string, index) <- strings.zipWithIndex)
       | { println("str: "+string + " idx: "+index) }
str: a idx: 0
str: b idx: 1
str: c idx: 2

看,不需要case关键字.

Answer 2

strings.zipWithIndex.foreach{case(x,y) => println(x,y)}

RES:

(a,0)
(b,1)
(c,2)