swiftのprint()をカスタマイズ

print.swift

func print(_ items: Any..., separator: String = " ", terminator: String = "\n") {
    #if DEBUG
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
    // 文頭に日時を付与する
    Swift.print(formatter.string(from: Date()), terminator: " ")
    Swift.print(items, separator: separator, terminator: terminator)
    #else
    // なにもしない
    #endif
}