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Variadic functions (...T)
source link: https://yourbasic.org/golang/variadic-function/
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Variadic functions (...T)
yourbasic.org/golang
Basics
If the last parameter of a function has type ...T
it can be called with any number of trailing arguments of type T.
func Sum(nums ...int) int {
res := 0
for _, n := range nums {
res += n
}
return res
}
func main()
fmt.Println(Sum()) // 0
fmt.Println(Sum(1, 2, 3)) // 6
}The actual type of ...T inside the function is []T.
Pass slice elements to a variadic function
You can pass the elements of a slice s directly to a variadic function using the s... notation.
In this case no new slice is created.
primes := []int{2, 3, 5, 7}
fmt.Println(Sum(primes...)) // 17Append is variadic
The built-in append function is variadic and can be used to append any number of elements to a slice.
As a special case, you can append a string to a byte slice:
var buf []byte
buf = append(buf, 'a', 'b')
buf = append(buf, "cd"...)
fmt.Println(buf) // [97 98 99 100]Further reading
How to append anything (element, slice or string) to a slice
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