Why do we not have a `buildString` which takes a s...

# stdlib

[nkiesel]

Why do we not have a buildString which takes a separator as an optional parameter? Right now I use e.g. buildList { ... add(..) }.joinToString(" ") but buildString(" ") { ... add(...) } would be nicer. And perhaps also supports the "prefix" and "suffix" from Java's StringJoiner?

[louiscad]

You can use an extension to append with a space if you dislike joinTo/joinToString

[arekolek]

Extension function for StringBuilder probably can't handle something like:

buildList {
  repeat(3) {
    add("a")
    add("b")
  }
}.joinToString(" ")

[arekolek]

@nkiesel I guess what you want is just simply this?

fun joinToString(
        delimiter: CharSequence,
        prefix: CharSequence = "",
        suffix: CharSequence = "",
        joinerAction: StringJoiner.() -> Unit
): String = StringJoiner(delimiter, prefix, suffix).apply(joinerAction).toString()