How can I programmatically find Swift’s version?

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You can use conditional compilation directives to test for the specific Swift version used to build your project:

#if swift(>=5.0)
print("Hello, Swift 5!")
#elseif swift(>=4.0)
print("Hello, Swift 4!")
#elseif swift(>=3.0)
print("Hello, Swift 3!")
#elseif swift(>=2.2)
print("Hello, Swift 2.2!")
#elseif swift(>=2.1)
print("Hello, Swift 2.1!")
#endif

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