made averageCalc variadic

playground/averageHeadFirstVariadic.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func averageCalc(numbers ...float64) float64 {
+	var sum float64 = 0
+	for _, number := range numbers {
+		sum += number
+	}
+	return sum / float64(len(numbers))
+}
+
+func averageHeadFirstVariadic() {
+	arguments := os.Args[1:]
+	var numbers []float64
+	for _, argument := range arguments {
+		number, err := strconv.ParseFloat(argument, 64)
+		Error(err)
+		numbers = append(numbers, number)
+	}
+	fmt.Printf("Average: %0.2\n", averageCalc(numbers...))
+}