Xcode playground not executing functions

Because you didn't call the function. Just call it:

func hello()
{
    print("Hello, World")
}

hello()

Also, If you are calling the method before its implementation, the Swift Playground wouldn't allow you to do that, and errors out as below

Use of unresolved identifier 'hello'

WRONG ORDER:

hello()
func hello()
{
    print("Hello, World")
}

RIGHT ORDER

func hello()
{
    print("Hello, World")
}
hello()

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