adding variadic functions

Author: symonk

README.md

@@ -24,6 +24,7 @@ all the examples `Run` functions sequentially in line with the table of contents
 * [10 - Maps](maps/main.go)
 * [11 - Range](ranges/main.go)
 * [12 - Functions](functions/main.go)
+* [13 - Variadic Functions](variadicfunctions/main.go)
 * [25 - Timers](timers/main.go)
 * [26 - Tickers](tickers/main.go)
 * [27 - WorkerGroups](workergroups/main.go)

main.go

@@ -8,6 +8,7 @@ import (
 	"github.com/symonk/learning-golang/arrays"
 	"github.com/symonk/learning-golang/constants"
 	"github.com/symonk/learning-golang/forloop"
+	"github.com/symonk/learning-golang/functions"
 	"github.com/symonk/learning-golang/helloworld"
 	"github.com/symonk/learning-golang/ifelse"
 	"github.com/symonk/learning-golang/maps"
@@ -22,7 +23,7 @@ import (
 )
 
 var (
-	functions = []func(){
+	allFunctions = []func(){
 		helloworld.Run,
 		values.Run,
 		variables.Run,
@@ -37,13 +38,15 @@ var (
 		timers.Run,
 		tickers.Run,
 		workergroups.Run,
+		functions.Run,
+		variables.Run,
 	}
 )
 
 func main() {
 	/* Run all modules synchronously.  Modules have avoided builtins and are occassionally
 	pluralised in their naming, i.e switches. */
-	for _, callable := range functions {
+	for _, callable := range allFunctions {
 		fmt.Println("-----")
 		fmt.Printf("Executing %s\n", runtime.FuncForPC(reflect.ValueOf(callable).Pointer()).Name())
 		callable()

variadicfunctions/main.go

@@ -0,0 +1,22 @@
+package variadicfunctions
+
+import "fmt"
+
+func Run() {
+	fmt.Println(sumOfVariableArgs(1, 2, 3, 4, 5)) // 15
+	slice := []int{9, 9, 9}
+	fmt.Println(sumOfVariableArgs(slice...)) // 27
+}
+
+/*
+	This is an example of a variadic function.
+
+One that accepts a variable number of arguments
+*/
+func sumOfVariableArgs(args ...int) int {
+	total := 0
+	for arg := range args {
+		total += arg
+	}
+	return total
+}