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How to use Ellipsis (…) in Golang?
  • Last Updated : 19 May, 2020

The three dots () in Golang is termed as Ellipsis in Golang which is used in the variadic function. The function that called with the varying number of arguments is known as variadic function. Or in other words, a user is allowed to pass zero or more arguments in the variadic function. fmt.Printf is the example of the variadic function, it required one fixed argument at the starting after that it can accept any number of arguments.

The last parameter of the variadic function is always using the Ellipsis. It means it can accept any number of arguments.

Example 1:

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// 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)
    }
}

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Output:

Hello Rahul
Hello Mohit
Hello Rahul
Hello Rohit
Hello Johny

Example 2:

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// Golang program to show
// how to use Ellipsis (…)
package main
  
import (
    "fmt"
)
  
// using a varidic 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)
}

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Output:

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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