lateinit-val.kt

fun doSomething(path: String) {
  val content: String //instead of declare as `var content: String? = null`
  
  val br = BufferedReader(FileReader(path))
  var currentLine = br.readLine()
  content = buildString {
    while (currentLine != null) {
      appendln(currentLine)
      currentLine = br.readLine()
    }
  }
  
  println(content) //print all content
}