Function map 

pub fn map<T, U, E, F>(items: Vec<T>, f: F) -> Result<Vec<U>, MapError>
where
    F: FnMut(T) -> Result<U, E>,
    E: Display,

Applies f to items sequentially and returns results in their original order.

Each successful input is evaluated exactly once. Evaluation stops at the first callback error, and trailing unconsumed items are dropped naturally. Errors report a zero-based input index and a message truncated at a UTF-8 character boundary to at most 4096 bytes. This serial operation has no serde, Send, Sync, or 'static requirements.

Example

use hataori::map;

let doubled = map(vec![1, 2, 3], |item| {
    Ok::<_, std::convert::Infallible>(item * 2)
})
.unwrap();
assert_eq!(doubled, vec![2, 4, 6]);