const set = new Set();
function Walk(obj, parentObject, propertyName, path=[])
{
    if(obj !== null && typeof obj === "object")
    {
        if(set.has(obj))
        {
            console.log("ive been to", obj, "quitting");
            return;
        }
        else
        {
            set.add(obj);
            console.log("ive never seen", obj, "here are its fields:");
            console.log("-----------------");
            for(let key in obj)
            {
                const val = obj[key];
                console.log(key, val);
                Walk(val, obj, key);
            }
            console.log("-----------------");
        }
    }
    else
    {
        console.log(obj, "is a leaf")
    }
}

const root = {hey:"1", deep:{}, arr:["a", "b"]};
root.circ = root;
Walk(root);