5.7 Variadic Functions
A variadic function is one that can be called with varying
numbers of arguments.
The most familiar examples are fmt.Printf
and its variants.
Printf
requires one fixed argument at the beginning,
then accepts any number of subsequent arguments.
To declare a variadic function, the type of the final
parameter is preceded by an ellipsis, “...
”, which
indicates that the function may be called with any number
of arguments of this type.
func sum(vals ...int) int { total := 0 for _, val := range vals { total += val } return total }
The sum
function above returns the sum of zero or more
int
arguments.
Within the body of the function, the type of vals
is
an []int
slice.
When
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