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csv

polyoxide_core

Function csv 

Source 
pub fn csv<I, S>(values: I) -> Option<String>
where
    I: IntoIterator<Item = S>,
    S: ToString,
Expand description

Comma-joins a multi-value query parameter; None when the joined value is empty, so the parameter is omitted rather than sent empty.

assert_eq!(polyoxide_core::csv(["a", "b"]), Some("a,b".to_owned()));
assert_eq!(polyoxide_core::csv(Vec::<String>::new()), None);
assert_eq!(polyoxide_core::csv([""]), None);