Function fmt_elements_split_by_commas

datafusion/datasource/src/display.rs:115–131

helper formatting array elements with a comma and a space between them

(
    iter: I,
    f: &mut Formatter,
    format_element: F,
)

/// helper formatting array elements with a comma and a space between them
fn fmt_elements_split_by_commas<E, I, F>(
    iter: I,
    f: &mut Formatter,
    format_element: F,
) -> FmtResult
where
    I: Iterator<Item = E>,
    F: Fn(E, &mut Formatter) -> FmtResult,
{
    for (idx, element) in iter.enumerate() {
        if idx > 0 {
            write!(f, ", ")?;
        }
        format_element(element, f)?;
    }
    Ok(())
}

#[cfg(test)]
mod tests {