https://www.pcgamer.com/fortnite-on-nintendo-switch-supports-crossplay-with-pc/

During Nintendo's E3 2018 splurge yesterday, the battle royale component of Fortnite launched for Nintendo Switch. And just like the smartphone versions of the game, it supports crossplay with PC. In other words, next time you log-in to the game, you'll be able to take out (or be taken out by) Nintendo Switch players.

It's not exactly unexpected: Fortnite supports crossplay between Xbox One, MacOS, iOS and PC, and despite the huge input differences ranging across those platforms, it does a pretty good job. You'll note the conspicuous absence of PS4 from that list, though: players on Sony's platform still cannot play with other console platforms.