Go 语言规范Passing arguments to ... parameters
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If f is variadic with a final parameter p of type ...T, then within f the type of p is equivalent to type []T. If f is invoked with no actual arguments for p, the value passed to p is nil. Otherwise, the value passed is a new slice of type []T with a new underlying array whose successive elements are the actual arguments, which all must be assignable to T. The length and capacity of the slice is therefore the number of arguments bound to p and may differ for each call site.
Given the function and calls
func Greeting(prefix string, who ...string)
Greeting("nobody")
Greeting("hello:", "Joe", "Anna", "Eileen")
within Greeting, who will have the value nil in the first call, and []string{"Joe", "Anna", "Eileen"} in the second.If the final argument is assignable to a slice type []T, it is passed unchanged as the value for a ...T parameter if the argument is followed by .... In this case no new slice is created.
Given the slice s and call
s := []string{"James", "Jasmine"}
Greeting("goodbye:", s...)within Greeting, who will have the same value as s with the same underlying array.
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