Function reject_with

pub fn reject_with<T: PartialEq>(
    it: impl Iterator<Item = T>,
    callback: impl FnMut(&T) -> bool,
) -> Result<impl Iterator<Item = T>, Infallible>

Returns an iterator without filtered out values.

fn is_odd(v: &&u32) -> bool {
    **v & 1 != 0
}

#[derive(Template)]
#[template(
      ext = "html",
      source = r#"{% for elem in numbers | reject(self::is_odd) %}{{ elem }},{% endfor %}"#,
)]
struct Example {
    numbers: Vec<u32>,
}

assert_eq!(
    Example { numbers: vec![1, 2, 3, 4] }.to_string(),
    "2,4,"
);