Completed goroutine channels exercise

Finally starting to get the hang of how channels in goroutines work,
just pass the values around using arrows after creating the channel
using c := make(chan $TYPE)

golangr/goroutines/2.go

@@ -9,12 +9,16 @@ import (
 var numsToSum []int
 var choice2 int
 
-// TODO: Get function done
+func getAverage(arr []int, c chan int) {
-func getAverage() {
+	sum := 0
+	for i := 0; i < len(arr); i++ {
+		sum = sum + arr[i]
+	}
 
+	c <- sum
 }
 
-func addToVec(num int, c chan int) {
+func addToVec(num int) {
 	numsToSum = append(numsToSum, num)
 }
 
@@ -39,7 +43,10 @@ func getNumToAdd() (num int) {
 }
 
 func fun2() {
+
+	// Create channel made for int values
 	c := make(chan int)
+
 looper:
 	for {
 		clear()
@@ -48,14 +55,31 @@ looper:
 		getChoice2()
 
 		switch choice2 {
-		// TODO: Add options to add numbers to array and then to calcluate them later
+
 		case 1:
 			numToAdd := getNumToAdd()
-			addToVec(numToAdd, c)
+			addToVec(numToAdd)
 			fmt.Printf("Succesfully added %v to the array\n", numToAdd)
 			time.Sleep(time.Second)
 		case 2:
-			getAverage()
+			// Send function call to goroutine while providing the channel for communication
+			go getAverage(numsToSum, c)
+
+			fmt.Printf("\rThinking.")
+			time.Sleep(time.Second)
+			fmt.Printf("\rThinking..")
+			time.Sleep(time.Second)
+			fmt.Printf("\rThinking...")
+			time.Sleep(time.Second)
+			fmt.Printf("\r\n")
+
+			// Get the result returned by the goroutine
+			total := <-c
+			average := total / len(numsToSum)
+
+			fmt.Printf("The grand total is %v\n", total)
+			fmt.Printf("The average value is %v\n", average)
+			time.Sleep(time.Second * 3)
 		case 3:
 			break looper
 		}

golangr/goroutines/main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"time"
 )
 
 var check bool = false
@@ -14,6 +15,7 @@ func main() {
 	var numChoice int
 
 	for {
+		clear()
 		fmt.Printf("[1] Basic concurrency\n")
 		fmt.Printf("[2] Channels\n")
 
@@ -32,6 +34,7 @@ func main() {
 			os.Exit(0)
 		default:
 			fmt.Printf("Choose an actual function, please\n")
+			time.Sleep(time.Second)
 		}
 	}