Execute a condition if a certain value is passed in the cookie?

Question

JavaScript

On the site, I can change the city, and its value is stored in cookies, and the city itself is stored in this format
in a json file

{ "CityId": 781, "Name": "Санкт-Петербург", "RegionId": 58 },

I need to make a condition that if, for example, a CityId equal to 781 is passed in cookies, or something like that, then my code is executed. And can this be done in js?

Answer 1

function getCookie(name) {
    function escape(s) { return s.replace(/([.*+?\^${}()|\[\]\/\\])/g, '\\$1'); };

    var match = document.cookie.match(RegExp('(?:^|;\\s*)' + escape(name) + '=([^;]*)'));

    return match ? match[1] : null;
};

var cities = [{ "CityId": 781, "Name": "Санкт-Петербург", "RegionId": 58 }],
    currentCity = cities.filter(function(data) {
        var currentCityId = getCookie('CityId');

        return data.CityId == currentCityId;
    });

console.log(currentCity);