我可以在 Scala 中将一个元素生成或映射为多个元素吗? [英] Can I yield or map one element into many in Scala?

问题描述

val inArray = Array("a", "b", "c", "d")
// ...
val outArray = Array("a1", "a2", "a3", "b1", "b2", "b3", "c1", "c2", "c3", "d1", "d2", "d3")

如何将inArray映射到outArray?

这个想法是遍历 inArray，从每个元素中产生 3 个元素(在这个例子中通过连接一个索引).

The idea is to iterate through inArray yielding 3 elements (by concatenating an index in this example) from each of its elements.

推荐答案

您可以使用 flatMap 做到这一点.

You can do that with flatMap.

inArray.flatMap(c => (1 to 3).map(c+))

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