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Go Function Parameters and Arguments


Parameters and Arguments

Information can be passed to functions as a parameter. Parameters act as variables inside the function.

Parameters and their types are specified after the function name, inside the parentheses. You can add as many parameters as you want, just separate them with a comma:

Syntax

func FunctionName(param1 type, param2 type, param3 type) {
  // code to be executed
}

Function With Parameter Example

The following example has a function with one parameter (fname) of type string. When the familyName() function is called, we also pass along a name (e.g. Liam), and the name is used inside the function, which outputs several different first names, but an equal last name:

Example

package main
import ("fmt")

func familyName(fname string) {
  fmt.Println("Hello", fname, "Refsnes")
}

func main() {
  familyName("Liam")
  familyName("Jenny")
  familyName("Anja")
}

Result:

Hello Liam Refsnes
Hello Jenny Refsnes
Hello Anja Refsnes
Try it Yourself »

Note: When a parameter is passed to the function, it is called an argument. So, from the example above: fname is a parameter, while Liam, Jenny and Anja are arguments.


Multiple Parameters

Inside the function, you can add as many parameters as you want:

Example

package main
import ("fmt")

func familyName(fname string, age int) {
  fmt.Println("Hello", age, "year old", fname, "Refsnes")
}

func main() {
  familyName("Liam", 3)
  familyName("Jenny", 14)
  familyName("Anja", 30)
}

Result:

Hello 3 year old Liam Refsnes
Hello 14 year old Jenny Refsnes
Hello 30 year old Anja Refsnes
Try it Yourself »

Note: When you are working with multiple parameters, the function call must have the same number of arguments as there are parameters, and the arguments must be passed in the same order.