Golang Variadic Functions - Getting Started with Golang
In this Getting Started with Golang, we will learn how to use the Golang Variadic Functions that can accept multiple values with different types of the variable at the same time with step by step guide in Golang programming language.
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Source Codes:
package main
import (
"errors"
"fmt"
"reflect"
"strings"
)
func addition(num ...float64) float64 {
var result float64 = 0
for _, e := range num {
result += e
}
return result
}
func calc(transType string, amount ...float64) (float64, error) {
var totalAmount float64 = 0
if len(strings.TrimSpace(transType)) == 0 {
return 0, errors.New("transaction type is required")
}
for n, a := range amount {
switch strings.TrimSpace(transType) {
case "addition":
totalAmount += a
case "substract":
if n greater than 0 {
totalAmount -= a
} else if n == 0 {
totalAmount = a
}
}
}
return totalAmount, nil
}
func strVariadic(strVal ...string) {
for n, s := range strVal {
fmt.Println("n: ", n, " s: ", s)
}
}
type user struct {
username, firstname, lastname string
}
func strVariadicInterface(strVal ...interface{}) {
for _, i := range strVal {
fmt.Println(i, ": ", reflect.ValueOf(i).Kind())
}
}
func main() {
fmt.Println("Hello Variadic Function")
add := addition(2, 2, 4)
fmt.Println("add: ", add)
// addition variadic function
amount, err := calc("addition", 10, 12, 3)
if err != nil {
fmt.Println("Oops!, got some errors: ", err)
}
fmt.Println("addition: ", amount)
// string variadic
strVariadic("a", "b", "c")
strVariadicInterface(user{
username: "jr",
firstname: "john",
lastname: "rambo",
}, 10.66, "hello")
}
