Function prod

std/math/src/main/float.rs:269–274

(it: Handle, kw: Kwargs)

// `prod(iterable, *, start=1.0)`. Returns a float; integer inputs lose their int-ness.
#[plugin_fn]
fn prod(it: Handle, kw: Kwargs) -> Result<f64> {
    let mut acc = kw.get::<f64>("start")?.unwrap_or(1.0);
    let iter = it.iter()?;
    while let Some(h) = iter.iter_next()? { acc *= f64::from_handle(h.raw())?; }
    Ok(acc)
}