Nice to have independent functions

functions.js

function objectToQueryStr(object) {
    if (typeof object !== 'object') {
        return '';
    }

    return Object.keys(object).reduce(function (acc, key) {
        var item = key + '=' + encodeURI(object[key].toString());
        if (acc.length) {
            return acc + '&' + item;
        }
        return acc + item;
    }, '');
}

function queryStrToObject(qs) {
    if (!qs.length && typeof qs !== 'string') {
        return {};
    }

    return qs.split('&').reduce(function (acc, item) {
        var key = item.split('=', 2)[0];
        var val = item.split('=', 2)[1] || item;
        acc[key] = val;
        return acc;
    }, {});
}