homebrew で入れます。
$ brew tap dart-lang/dart
$ brew install dart
==> Installing dart from dart-lang/dart
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.1.0/sdk/dartsdk-macos-x64-release.zip
######################################################################## 100.0%
==> Caveats
Please note the path to the Dart SDK:
/usr/local/opt/dart/libexec
==> Summary
🍺 /usr/local/Cellar/dart/2.1.0: 339 files, 300.1MB, built in 33 seconds
$ dart --version
Dart VM version: 2.1.0 (Tue Nov 13 18:22:02 2018 +0100) on "macos_x64"brew コマンドがない人は以下で入れます。
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
