why do i get `Exception in thread "main" java.lang...

# announcements

[Smallville7123]

why do i get Exception in thread "main" java.lang.IndexOutOfBoundsException: start 4, end 3, s.length() 3 for https://pl.kotl.in/PEocYV7Ns

fun String.padShrinkEnd(to: Int, char: Char): String {
    val thisLength = this.length
    val build = this.removeRange(to..thisLength).toStringBuilder()
    while(build.length < thisLength) build.append(char)
    return build.toString()
}

fun main() {
    println("\"" + "abc".padShrinkEnd(2, ' ') + "\"")
}

[streetsofboston]

Not sure about your use-case, but this solve the exception:
Change
val build = this.removeRange(to..thisLength).toStringBuilder()
into
val build = this.removeRange(to until thisLength).toStringBuilder()

(replace .. with `until`; was easy to debug, though…)

[streetsofboston]

Although, the endIndex of removeRange is one past the position of the chars to be removed, according to the doc. The string’s length should be a valid value for `endIndex`….

[streetsofboston]

It seems endIndex is inclusive for the range to remove… while the documentation says it is not inclusive….

[ilya.gorbunov]

endIndex parameter is exclusive, however if you make a range from it and pass that range to removeRange the end index of that range is inclusive.

[ilya.gorbunov]

Note that this.removeRange(to. thisLength) is equivalent to this.substring(0, to) or just this.take(to)

[Smallville7123]

is this.take equivilant to this.dropLast

[ilya.gorbunov]

take(n) is equivalent to dropLast(size - n)

[Smallville7123]

ok