ターミナルを起動後、以下のコマンドを入力する。
swift -version
例）
$ swift -version
Apple Swift version 4.2 (swiftlang-1000.11.37.1 clang-1000.11.45.1)
Target: x86_64-apple-darwin17.7.0
More than 5 years have passed since last update.
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