Go Functions: Parameters/Arguments #

Information can be passed to functions as parameters. Parameters act as variables inside the function, and you can pass different values each time the function is called.

Function Parameters Syntax #

Parameters and their types are specified after the function name, inside parentheses ().

Syntax:

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

Function with a Single Parameter #

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

Note: When a parameter is passed to the function, it is called an argument. In the example above:

• fname is a parameter
• "Liam", "Jenny", "Anja" are arguments

Function with Multiple Parameters #

You can add as many parameters as needed, separated by commas.

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

Important: When 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.

Using parameters makes functions flexible and reusable, allowing them to operate on different data each time they are called.