How to check if a 'Storage ' entry exists?

This works for me. It's based on the fact that addr is zero when a file does not exist. When a file exists addr is not zero but points to an address in Storage.

var Storage = require("Storage");

l=Storage.list();
print(l);

function exists(name){
  return Boolean(Storage.open(name,"r").addr);
}

print(exists("news.txt"));
print(exists("nonews.txt"));

The output is:

[
"news.txt\1",
"weath0.txt\1",
"weath1.txt\1",
"stocks.txt\1",
"messages.txt\1"
]
true
false