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")
}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)
}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.