如何从Scala中的Set获取随机元素 [英] How to get a random element from a Set in Scala

问题描述

对于任何给定的集合，例如

For any given set, for instance,

val fruits = Set("apple", "grape", "pear", "banana")

如何从 / code>？

how to get a random element from fruits ?

非常感谢。

推荐答案

转换为向量并从中获取随机元素

convert into Vector and get random element from it

scala> val fruits = Set("apple", "grape", "pear", "banana")
fruits: scala.collection.immutable.Set[String] = Set(apple, grape, pear, banana)

scala> import scala.util.Random
import scala.util.Random

scala> val rnd=new Random
rnd: scala.util.Random = scala.util.Random@31a9253

scala> fruits.toVector(rnd.nextInt(fruits.size))
res8: String = apple

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