Params fn

params.js

/* takes a list of params in the format
    [{
        key: 'foo'
        value: 'bar'
    }]
    or an object with key-value params
    {
        foo: 'bar'
    }
}
*/
export const paramString = (params = [], encode = false) => {
    let encodeFn = encode ? mergeTagSafeEncode : _.identity;
    let buildPair = (value, key) => `${encodeFn(key)}=${encodeFn(value)}`;
    if (_.isArray(params)) {
        params = _(params)
            .filter(_.isObject)
            .map(
                ({ key, value }) => (key && value ? buildPair(value, key) : '')
            )
            .value();
    } else {
        params = _.map(params, buildPair);
    }
    return params.length ? `?${params.join('&')}` : '';
};

mergeTagSafeEncode is a domain specific function in my use, but for general use you could replace it with encodeURIComponent