Is there a way to open and close a stream easily at kotlin? [duplicate]

Question

What I have to do at java:

try(InputStream inputStream = new FileInputStream("/home/user/123.txt")) {

    byte[] bytes = new byte[inputStream.available()];
    inputStream.read(bytes);
    System.out.println(new String(bytes));


} catch (IOException e) {
    e.printStackTrace();
} 

But kotlin doesn't know about try-with-resources! So my code is

try {
    val input = FileInputStream("/home/user/123.txt")
} finally {
    // but finally scope doesn't see the scope of try!
}

Is there an easy way to close the stream ? And I don't speak only about files. Is there a way to close any stream easily ?

Answer 1

Closeable.use is what you're looking for:

val result = FileInputStream("/home/user/123.txt").use { input ->
    //Transform input to X
}