How to assign value of latitude and langtide google map on e

problem

I need to assign value of latitude and langtide on event ngOnInit ?

I work on angular 7

I assign value of latitude and alngtude on ngoninit but not work

ngOnInit() {

this.lat = value

this.lng= value

}

so How to assign values of lng and lat on event ngoninit and display google map

based on values assigned on ngoninit event

import { Component, AfterViewInit, ViewChild, ElementRef } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements AfterViewInit {
title = 'angular-gmap';
@ViewChild('mapContainer', { static: false }) gmap: ElementRef;
map: google.maps.Map;
lat = 40.73061;
lng = -73.935242;
coordinates = new google.maps.LatLng(this.lat, this.lng);
mapOptions: google.maps.MapOptions = {
center: this.coordinates,
zoom: 8
};
marker = new google.maps.Marker({
position: this.coordinates,
map: this.map,
title: 'Hello World!'
});
ngOnInit() {
//here i need to assign values of lat and lng and display map based on these values
console.log("Hi man");
}
ngAfterViewInit() {
console.log("Hi women");
this.mapInitializer();
}
mapInitializer() {
this.map = new google.maps.Map(this.gmap.nativeElement, this.mapOptions);
this.marker.setMap(this.map);
}
}