I encounter a js function snippet, list as follows

each = function(obj, fun) {
if (typeof fun != "function") {
    return obj
}
if (obj) {
    var return_value;
    if (obj.length === undefined) {
        for (var name in obj) {
            if (name in {}) { // how to undertand this line, what's purpose?
                continue
            }
            return_value = fun.call(obj[name], obj[name], name);
            if (return_value == "break") {
                break
            }
        }
    } else {
        for (var i = 0,
        length = obj.length; i < length; i++) {
            return_value = fun.call(obj[i], obj[i], i);
            if (return_value == "break") {
                break
            }
        }
    }
}
return obj

};

Thanks for your answer:)