How to pass variable length arguments as arguments on another function in Golang?

Question

How to pass variable length arguments in Go? for example, I want to call

func MyPrint(format string, args ...interface{}) {
  fmt.Printf("[MY PREFIX] " + format, ???)
}

// to be called as: MyPrint("yay %d", 213) 
//              or  MyPrint("yay")
//              or  MyPrint("yay %d %d",123,234)

daplho · Accepted Answer · 2019-02-14 06:14:34Z

113

Ah found it...functions that accept variable length arguments are called Variadic Functions. Example:

package main

import "fmt"

func MyPrint(format string, args ...interface{}) {
  fmt.Printf("[MY PREFIX] " + format, args...)
}

func main() {
 MyPrint("yay %d %d\n",123,234);
 MyPrint("yay %d\n ",123);
 MyPrint("yay %d\n");
}

edited Feb 14, 2019 at 6:14

daplho

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answered Nov 27, 2014 at 11:07

Kokizzu

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2 Comments

hsluo Over a year ago

For those who want the reference...see Effective Go

Nick Over a year ago

Note that the final call to MyPrint is missing a parameter and so fmt will complain that the argument to be printed by the %d is missing

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