scala map,flatmap,filter的用法_scala map filter-CSDN博客

网站介绍:文章浏览阅读1.8k次。例子:object test extends App { val fruits = Seq("apple", "banana", "orange") println(fruits.map(_.toUpperCase)) println(fruits.flatMap(_.toUpperCase))}输出:List(APPLE, BANANA, ORANGE)List(_scala map filter