Function fmty::csv_once

pub fn csv_once<I>(iter: I) -> CsvOnce<I::IntoIter>where
    I: IntoIterator,

Concatenates Iterator items with , between each, at most once.

This is equivalent to join_once(iter, ", ").

This is a non-Clone alternative to csv(). It uses interior mutability to take ownership of the iterator in the first call to Display::fmt(). As a result, CsvOnce does not implement Sync.

Examples

let value = fmty::csv_once(["hola", "mundo"]);
assert_eq!(value.to_string(), "hola, mundo");

assert_eq!(value.to_string(), "");