Golang 中省略号(…)怎么用？
Golang 中的三个点( … )被称为 Golang 中的省略号，用于变量函数。用不同数量的参数调用的函数称为变量函数。或者换句话说，允许用户在变量函数中传递零个或多个参数。fmt。Printf 是变量函数的例子，它在开始时需要一个固定的参数，之后它可以接受任意数量的参数。
变量函数的最后一个参数总是使用省略号。这意味着它可以接受任何数量的参数。
例 1:
Go
// Golang program to show
// how to use Ellipsis (…)
package main
import "fmt"
func main() {
sayHello()
sayHello("Rahul")
sayHello("Mohit", "Rahul", "Rohit", "Johny")
}
// using Ellipsis
func sayHello(names ...string) {
for _, n := range names {
fmt.Printf("Hello %s\n", n)
}
}
输出:
Hello Rahul
Hello Mohit
Hello Rahul
Hello Rohit
Hello Johny
例 2:
Go
// Golang program to show
// how to use Ellipsis (…)
package main
import (
"fmt"
)
// using a variadic function
func find(num int, nums ...int) {
fmt.Printf("type of nums is %T\n", nums)
found := false
for i, v := range nums {
if v == num {
fmt.Println(num, "found at index", i, "in", nums)
found = true
}
}
if !found {
fmt.Println(num, "not found in ", nums)
}
fmt.Printf("\n")
}
func main() {
// calling the function with
// variable number of arguments
find(89, 89, 90, 95)
find(45, 56, 67, 45, 90, 109)
find(78, 38, 56, 98)
find(87)
}
输出:
type of nums is []int
89 found at index 0 in [89 90 95]
type of nums is []int
45 found at index 2 in [56 67 45 90 109]
type of nums is []int
78 not found in [38 56 98]
type of nums is []int
87 not found in []
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