Explanation of error using newlatlngbounds(latlngbounds int)
It seems like there is a typo in your code or function name. The correct function name should be newLatLngBounds instead of newlatlngbounds. Note that the function name is case-sensitive, so make sure to use the correct case.
The newLatLngBounds function is used to create a LatLngBounds object that represents a box bounding the given LatLng bounds. This can be useful when you want to display a map that fits the specified area on your website or application. The function usually takes two parameters, which are the southwest and northeast corners of the bounds.
Example:
// Create the southwest and northeast corners of the bounds
var southwest = L.latLng(42.345, -71.098);
var northeast = L.latLng(42.358, -71.082);
// Create a LatLngBounds object using the newLatLngBounds function
var bounds = L.latLngBounds(southwest, northeast);
// Use the bounds object to fit the map within the specified area
map.fitBounds(bounds);
In the above example, we create a LatLng object for the southwest and northeast corners, and then pass those objects to the newLatLngBounds function to create a LatLngBounds object. Finally, we use the fitBounds method of the map to adjust the map’s zoom level and position to fit within the specified bounds.