From Press Release:
CARY, N.C. (June 12, 2018) — Today, Epic Games is excited to announce that Fortnite Battle Royale will be available today on Nintendo Switch. Starting today, players can download the game for free on the Nintendo eShop and squad up with their friends in the same room or around the world!
Fortnite Battle Royale for Nintendo Switch is the same game players know from PlayStation 4, Xbox One, PC, Mac, and mobile. Same gameplay, same map, same content, same weekly updates. With Switch, players can squad up with their friends in the same room or around the world, and even play on the go.