How to check if a 'Storage ' entry exists?

Great, I was just looking for some "file exists" code ;-)

The suggestions work OK for filenames without extension like "ABC". But I want to check for file "news.txt" and all variants report "false/missing".

This is my code

s = require('Storage');
file = { name : 'news.txt', exist : 0};

print(s.list());

// variant I
if (s.list().find(e => (e == file.name))) {
      file.exist = 1;
      console.log("I",file.name,"exists");
} else {
      file.exist = 1;
      console.log("I",file.name,"is missing ");
}
// variant II
if (s.read(file.name)) {
      file.exist = 1;
      console.log("II",file.name,"exists");
} else {
      file.exist = 1;
      console.log("II",file.name,"is missing ");
}

// variant III
print("III",s.list(/^file.name/));

// variant IV
print("IV",s.read(file.name)!==undefined­);

// variant V
print("V",s.read(file.name));

Output is
`

[
"news.txt\1",
"weath0.txt\1",
"weath1.txt\1",
"stocks.txt\1",
"messages.txt\1",
"ABC",
"news"
]
I news.txt is missing
II news.txt is missing
III [ ]
IV false
V undefined

`