Homebrew Flutter
Super-easy two-step Flutter installation with Homebrew
This will install the latest stable version of the framework directly from Google's servers.
Afterwards you can simply use flutter channel [master|dev|beta|stable] to switch between the different channels and flutter upgrade to upgarde to the latest version in the currently selected channel
Installing
brew tap flschweiger/flutter
brew cask install flutter
And voilà! You're done
FYI: You will find your Flutter installation here: /usr/local/Caskroom/flutter/latest/flutter.
Uninstalling
brew cask uninstall flutter
brew untap flschweiger/flutter
That's already it