Swift globals and global functions in objective c

Question

the documentation says:

Global constants defined in C and Objective-C source files are automatically imported by the Swift compiler as Swift global

Answer 1

Nice answer by @rintaro, but another alternative simple Swift answer for constants that can be used in both Swift and Objective-C:

@objcMembers
class MyConstants: NSObject {
    static let kMyConstant1 = "ConstantValue1";
    static let kMyConstant2 = "ConstantValue2";
    static let CARDS = ["card1", "card2"]
}

You can access this on both Swift and Objective-C by:

MyConstants.kMyConstant1 // this will return "ConstantValue1"
MyConstants.CARDS // this will return array ["card1", "card2"]