Disposable pattern to avoid resource leaks | High performance with idiomatic Kotlin

UseFunction.kt

inputStream.use {
    outputStream.use {
        // do something with the streams
        outputStream.write(inputStream.read())
    }
}

// improved option
arrayOf(inputStream, outputStream).use {
   // do something with the streams
   outputStream.write(inputStream.read())
}

// use implementation
private inline fun <T : Closeable?> Array<T>.use(block: ()->Unit) {
  // implementation
}