Plot reference lat/lon lines in Leaflet

Question

Basically taking the code from the sample provided by the leaflet website, I am able to get the general map for leaflet:

Now, I would like to add reference lat/lon lines. For example, 0, 10, 20, ... 90 degrees (East and West), and then also lines of longitude. There are examples of how to generate general lines connecting two points where I could, for example, get the International Date Line:

Now, if I wanted to add multiple lat/lons lines, I would basically need to create an entire new var to add, something like:

var ll1 = L.polygon([[-90,-180],[90,-180]]).addTo(map)
var ll2 = L.polygon([[-90,-170],[90,-170]]).addTo(map)
var ll3 = L.polygon([[-90,-160],[90,-160]]).addTo(map)
...
...

Is there an easier / more compact way to get all lat/lons at, for example, a 10-degree step between lines?