java.io.Reader extensions for doing something with each chars in Kotlin.

ReaderEx.kt

fun Reader.forEachChars(block: (Char) -> Unit) {
    while (true) {
        val c = read()
        if (c != -1) {
            block(c.toChar())
        } else return
    }
}

fun <R> Reader.mapEachChars(transform: (Char) -> R): List<R> {
    return mutableListOf<R>().apply {
        forEachChars { 
            add(transform(it)) 
        }
    }
}