1 files changed, 88 insertions, 0 deletions
diff --git a/challenge-133/ealvar3z/go/ch-2.go b/challenge-133/ealvar3z/go/ch-2.go
new file mode 100644
index 0000000000..0467691142
--- /dev/null
+++ b/challenge-133/ealvar3z/go/ch-2.go
@@ -0,0 +1,88 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+func sumDigits(n uint) uint {
+	var sum uint
+	for n != 0 {
+		sum += n % 10
+		n /= 10
+	}
+	return sum
+}
+
+func sumFactors(n []uint) uint {
+	var sum uint
+	for i := range n {
+		sum += sumDigits(n[i])
+	}
+	return sum
+}
+
+func factors(n uint) []uint {
+	var i uint = 2
+	fac := []uint{}
+	for i*i <= n {
+		if n%i != 0 {
+			i++
+		} else {
+			n /= i
+			fac = append(fac, i)
+		}
+	}
+	if n > 1 {
+		fac = append(fac, n)
+	}
+	return fac
+}
+
+func isSmithNum(n uint) bool {
+	fac := factors(n)
+	if len(fac) > 1 {
+		if sumDigits(n) == sumFactors(fac) {
+			return true
+		}
+	}
+	return false
+}
+
+func genSmithNums() <-chan uint {
+	// init our channel
+	c := make(chan uint)
+
+	// launch goroutine and send data to channel
+	go func() {
+		var i uint
+		for i = 4; ; i++ {
+			fac := factors(i)
+			if len(fac) < 2 {
+				continue
+			}
+
+			if isSmithNum(i) == true {
+				// once you find it: fire for effect!
+				c <- i
+				time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
+			}
+		}
+		close(c)
+	}()
+	return c
+}
+
+func main() {
+
+	// generate our SmithNums
+	mrSmith := genSmithNums()
+
+	for i := 0; i < 10; i++ {
+		// <- mrSmith read values from genSmithNums
+		// and wait for a value to be sent
+		fmt.Printf("%d\n", <-mrSmith)
+	}
+	fmt.Println("done")
+}