list - 如何在 Kotlin 中过滤 ArrayList，以便我只有符合我的条件的元素？

Question

我有一个数组:

var month: List<String> = arrayListOf("January", "February", "March")

我必须过滤列表，所以我只剩下 "January"。

Answer 1

您可以使用此代码从数组中过滤出一月，通过使用此代码

var month: List<String> = arrayListOf("January", "February", "March")
// to get the result as list
var monthList: List<String> = month.filter { s -> s == "January" }

// to get a string
var selectedMonth: String = month.filter { s -> s == "January" }.single()