Google Maps - Mark Clustener

Question

how I configure the line:
markerClusterer = new MarkerClusterer(map, markers);
On mark clustener, google maps, who is map and markers, give a example
Thanks

Sachin Singh · Accepted Answer

html,
body,
#map {
height: 100%;
margin: 0;
padding: 0;
}
function initMap() {
// map options
var options = {
zoom: 7,
center: {
lat: 53.3938131,
lng: -7.858913
}
}
var map = new google.maps.Map(document.getElementById('map'), options);
// Add a marker clusterer to manage the markers.
//Add marker
var markers = [
//Dublin
{
coords: {
lat: 53.338741,
lng: -6.261563
},
iconImage: 'assets/img/places/stparkdublin.png',
content: ' St Stephen’s Green ' + '
' + ' Learn More ' + ' http://ststephensgreenpark.ie/ '
},
{
coords: {
lat: 53.3755012,
lng: -6.2735677
},
iconImage: 'assets/img/places/botanic garden.png',
content: ' Botanic Garden ' + '
' + ' Learn More ' + ' http://botanicgardens.ie/ '
},
{
coords: {
lat: 53.355998576,
lng: -6.32166538
},
iconImage: 'assets/img/places/stparkdublin.png', ////////////////////add picture
content: ' Phoenix Park ' + '
' + ' Learn More ' + ' http://phoenixpark.ie/ '
},
{
coords: {
lat: 53.460259,
lng: -6.219985
},
iconImage: 'assets/img/places/swordscastle.png',
content: ' Swords Castle ' + '
' + ' Learn More ' + ' https://swordscastle.events/ '
},
{
coords: {
lat: 53.37923,
lng: -6.07201
},
iconImage: 'assets/img/places/Howth.png',
content: ' Howth ' + '
' + ' Learn More ' + ' http://www.visithowth.ie/ '
},
{
coords: {
lat: 55.1364,
lng: -7.456
},
iconImage: 'assets/img/places/buncrana1.png',
content: ' Buncrana ' + '
' + ' Learn More ' + ' https://en.wikipedia.org/wiki/Buncrana '
},
{
coords: {
lat: 53.152999388,
lng: -6.1499994
},
iconImage: 'assets/img/places/sugarloaf_icon.png',
content: ' Great sugar loaf ' + '
' + ' Learn More ' + ' http://visitwicklow.ie/item/the-sugarloaf-trail/ '
},
{
coords: {
lat: 52.0058,
lng: -9.5562
},
iconImage: 'assets/img/places/killarney.png',
content: ' Killarney National Park ' + '
' + ' Learn More ' + ' https://www.killarneynationalpark.ie/ '
},
{
coords: {
lat: 51.942662896,
lng: -9.917162998
},
iconImage: 'assets/img/places/clifs.png',
content: ' Ring of Kerry ' + '
' + ' Learn More ' + ' https://ringofkerrytourism.com/ '
},
{
coords: {
lat: 52.679,
lng: -7.814
},
iconImage: 'assets/img/places/clifs.png', //add picture!!!!!!!!!!!!!!!
content: ' Thurles ' + '
' + ' Learn More ' + ' https://www.tipperary.com/thurles '
},
{
coords: {
lat: 52.348,
lng: -6.517
},
iconImage: 'assets/img/places/wexford museum.png',
content: ' Irish National Heritage Park ' + '
' + ' Learn More ' + ' http://www.irishheritage.ie/ '
},
{
coords: {
lat: 53.018,
lng: -6.398
},
iconImage: 'assets/img/places/wicklow.png',
content: ' Wicklow Mountains National Park ' + '
' + ' Learn More ' + ' https://www.wicklowmountainsnationalpark.ie/ '
},
{
coords: {
lat: 53.011299,
lng: -6.326156
},
iconImage: 'assets/img/places/glendalough.png',
content: ' Glendalough ' + '
' + ' Learn More ' + ' http://www.glendalough.ie/ '
},
{
coords: {
lat: 53.1876492494,
lng: -6.083832998
},
iconImage: 'assets/img/places/Bray.png',
content: ' Bray ' + '
' + ' Learn More ' + ' http://www.bray.ie/ '
},
{
coords: {
lat: 53.144,
lng: -6.072
},
iconImage: 'assets/img/places/greystones.png',
content: ' Greystones ' + '
' + ' Learn More ' + ' http://visitwicklow.ie/item/greystones/ '
},
{
coords: {
lat: 52.518664592,
lng: -7.887329784
},
iconImage: 'assets/img/places/Cashel.png',
content: ' Rock of Cashel ' + '
' + ' Learn More ' + ' https://www.cashel.ie/ '
},
{
coords: {
lat: 52.6477,
lng: -7.2561
},
iconImage: 'assets/img/places/kilkenny.png',
content: ' Killenny ' + '
' + ' Learn More ' + ' https://visitkilkenny.ie/ '
},
//cork
{
coords: {
lat: 51.902694,
lng: -8.4767
},
iconImage: 'assets/img/places/butterCork.png',
content: ' Museum of Butter ' + '
' + ' Learn More ' + ' http://thebuttermuseum.com/ '
},
{
coords: {
lat: 51.89953,
lng: -8.499022
},
iconImage: 'assets/img/places/prisoncork.png',
content: ' Cork City Gaol ' + '
' + ' Learn More ' + ' https://corkcitygaol.com/ '
},
{
coords: {
lat: 53.4513204,
lng: -6.140871
},
iconImage: 'assets/img/places/malahideB.png',
content: ' Malahide ' + '
' + ' Learn More…

Naresh Beniwal · Answer

https://developers.google.com/maps/documentation/javascript/marker-clustering

HENRIQUE ITZCOVICI · Answer

Thank you !