JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://maps.google.com/maps/api/js?sensor=false&amp;.js"></script>
<div id="map"></div>

CSS

#map{
    
    width:500px;
    height: 500px;
}

JavaScript

var geocoder = new google.maps.Geocoder();
var markersArray = [];
var infowindow = new google.maps.InfoWindow();
var bounds = new google.maps.LatLngBounds();

var map = new google.maps.Map(document.getElementById('map'), {
  
  mapTypeId: google.maps.MapTypeId.ROADMAP
});

var postcodes = [
    "ул. уральская, д.12, Москва, Россия",
    "ул. уральская, д.5, Москва, Россия",
    "ул. уральская, д.1, Москва, Россия"   
];

var descriptions = [
    "Slateford",
    "Cortachy",
    "Marybank"
];

//create a location object
function location(postalcode, desc){
  this.PostalCode = postalcode;
  this.Description = desc;
}

//add each location to locations array
var locations = [];
for(var i = 0; i < postcodes.length; i++) {
     locations.push(new location(postcodes[i], descriptions[i]));
}

for(var i = 0; i < locations.length; i++) {
    GeoCode(locations[i]); 
}

function GeoCode(singleLocation){
     geocoder.geocode(
        {
            'address': singleLocation.PostalCode,
            'region' : ''
        }, 
        function(results, status){
            if (status == google.maps.GeocoderStatus.OK) {
               var marker = new google.maps.Marker({
                    position: results[0].geometry.location,
                    map: map
                });
                
                //quick and dirty way
                bounds.extend(marker.position);
                map.fitBounds(bounds);
                
                
                markersArray[i] = marker;
                console.log(markersArray[i]);
                
                google.maps.event.addListener(marker, 'click', function() {
                        infowindow.setContent(singleLocation.Description);
                        infowindow.open(map, this); //this refers to the marker
                });
                
            } else {
                alert("Geocode was not successful for the following reason: " + status);
                return false;
            }
        }
  ...