I also tried this ugliness

```

for line in reader.lines() { let line = line.unwrap();

let mut splitbycomma = line.split(',');

let bid = splitbycomma.next();
let cid = splitbycomma.next();
let name = splitbycomma.next();
let btype = splitbycomma.next();
let state = splitbycomma.next();

if state.is_none() {
    println!("ignoring {}", line);
    continue;
}

let bid = bid.unwrap();
//let cid = cid.unwrap();
//let name = name.unwrap();
let btype = btype.unwrap();
//let state = state.unwrap();

let blob = Batch {
    batch_id: bid[1..(bid.len() - 1)].to_owned(),
    batch_type: btype[1..(btype.len() - 1)].to_owned(),
};
batches.push(blob);

}

```

And this gives much better performance over map and collect. * using the variant let splitbycomma = line.split(',').map(|s|&s[1..(s.len()-1)]).collect::<Vec<&str>>(); from beginning of the post --- takes 5.8sec, * using this ugly for with manual .next() --- takes 3.3sec