boa_engine 0.22.0

Boa is a Javascript lexer, parser and compiler written in Rust. Currently, it has support for some of the language.
Documentation 
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use std::collections::HashSet;
use std::fmt;

use crate::{JsObject, builtins::set::ordered_set::OrderedSet};

pub(super) fn log_set_to(
    f: &mut fmt::Formatter<'_>,
    v: &JsObject,
    print_internals: bool,
    print_children: bool,
) -> fmt::Result {
    let set = v
        .downcast_ref::<OrderedSet>()
        .expect("object must be a set");
    let size = set.len();

    if size == 0 {
        return f.write_str("Set(0)");
    }

    if !print_children {
        return write!(f, "Set({size})");
    }

    f.write_str("Set { ")?;
    let mut first = true;
    for value in set.iter() {
        if !first {
            f.write_str(", ")?;
        }
        first = false;
        super::value::log_value_to(f, value, print_internals, false)?;
    }
    f.write_str(" }")
}

pub(super) fn log_set_compact(
    f: &mut fmt::Formatter<'_>,
    v: &JsObject,
    depth: u32,
    print_internals: bool,
    encounters: &mut HashSet<usize>,
) -> fmt::Result {
    let set = v
        .downcast_ref::<OrderedSet>()
        .expect("object must be a set");
    let size = set.len();

    if size == 0 {
        return f.write_str("Set(0)");
    }

    if depth >= super::value::COMPACT_DEPTH_LIMIT {
        return write!(f, "Set({size})");
    }

    f.write_str("Set { ")?;
    let mut first = true;
    for value in set.iter() {
        if !first {
            f.write_str(", ")?;
        }
        first = false;
        super::value::log_value_compact(f, value, depth + 1, print_internals, encounters)?;
    }
    f.write_str(" }")
}