The graphics section of pico8.txt contains the following function definition

map mx my sx sy [w h [layer]]

	draw section of map (in cels) at screen position sx, sy (pixels)
	if layer is specified, only cels with the same flag number set are drawn
		// Bitfield. So 0x5 means draw sprites with bit 0 and bit 2 set.
		// defaults to all sprites
	exception: sprite 0 is always taken to mean empty.

this is actually the definition for mapdraw. Calling map() opens the map tab of the editor.

At least, I think it is? I'm not 100%, but calling map() is definitely opening the editor for me and isn't drawing anything to the screen

What do the demos use to draw the map?

Old post, but found this via a search engine.
mapdraw() is the legacy function but still supported (the demo jelpi.p8 uses it).
map() is the new name.

map() is the console doesn't seem to open the map editor anymore.

From the log:

v0.1.0
Changed: renamed mapdraw() to map() for consistency