当字符串在数组中时，如何替换字符串中的最后一个字符 [英] How to replace last character in String when it is in an Array

问题描述

如果某些String以arrayOf(X, Y, Z)中的字符结尾，我想用新的char A替换它.我不知道该怎么做，而且我尝试过的所有方法都不起作用.

If some String ends with a character that is in arrayOf(X, Y, Z) I want to replace it with new char A. I don't know how to do this, and everything I've tried doesn't work.

推荐答案

您可以这样做:

var test = "Some string Z"

if (test.lastOrNull() in arrayOf('X', 'Y', 'Z')) //check if the last char == 'X' || 'Y' || 'Z'
{
    test = test.dropLast(1) + 'A' // if yes replace with `A`
}

println(test) // "Some string A"

---

或使用扩展功能:

---

Or with using extension function:

fun String.replaceLast(toReplace: CharArray, newChar: Char): String
{
    if (last() in toReplace)
    {
        return dropLast(1) + 'A'
    }
    return this
}

//Test
val oldTest = "Some string Z"
val newTest = oldTest.replaceLast(charArrayOf('X', 'Y', 'Z'), 'A')

println(newTest) // "Some string A"

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