getLatLngs used with polygon does not return array

[walterfn2]

How to reproduce

Leaflet version I'm using: 1.0.2
Browser (with version) I'm using: Chrome & FF
OS/Platform (with version) I'm using: Windows 10

What behaviour I'm expecting and which behaviour I'm seeing

getLatLngs used with polygon does not return array, but LatLngs as string. If used with polyline array of LatLng is returned. This worked fine with 0.7.7 version.

Minimal example reproducing the issue

var latlngs = [
	[45.51, -122.68],
	[37.77, -122.43],
	[34.04, -118.2]
	];
var polyline = L.polyline(latlngs, {color: 'red'}).addTo(map);
alert(polyline.getLatLngs().length);

var polygon = L.polygon([
	[51.509, -0.08],
	[51.503, -0.06],
	[51.51, -0.047]
	]).addTo(map);
alert(polygon.getLatLngs().length);

Using http://playground-leaflet.rhcloud.com/ or any other jsfiddle like site.

[walterfn2]

jsfiddle is here https://jsfiddle.net/qccxwp64/2/

[IvanSanchez]

The return value of L.Polygon.getLatLngs() is, in fact, an array of one element.

This is done in

Leaflet/src/layer/vector/Polygon.js

Line 106 in b1c2e99

this._latlngs = [this._latlngs];

since #3279 , to ensure that there is a list of rings, not a list of LatLngs. Simply use polygon.getLatLngs()[0] to get the LatLngs of the outer (and only) ring.

[walterfn2]

This explains everything, thank you very much!

[olivergg]

Shouldn't the official documentation http://leafletjs.com/reference-1.0.3.html#polyline-getlatlngs be changed to indicate something else than LatLng[] ?