From f3daa894afefb443a08a04217dbac38fcdb9b2c6 Mon Sep 17 00:00:00 2001
From: Jian Han <jian.han@neds.com>
Date: Sun, 3 Dec 2017 20:23:59 +1000
Subject: [PATCH] added iterator

---
 concurrency/iterator/main.go | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 concurrency/iterator/main.go

diff --git a/concurrency/iterator/main.go b/concurrency/iterator/main.go
new file mode 100644
index 0000000..31ac7fe
--- /dev/null
+++ b/concurrency/iterator/main.go
@@ -0,0 +1,24 @@
+package main
+
+import "fmt"
+
+// Generator func which produces data which might be computationally expensive.
+func fib(n int) chan int {
+	c := make(chan int)
+	go func() {
+		for i, j := 0, 1; i < n; i, j = i+j, i {
+			c <- i
+		}
+		close(c)
+	}()
+	return c
+}
+
+func main() {
+	// fib returns the fibonacci numbers lesser than 1000
+	for i := range fib(1000) {
+		// Consumer which consumes the data produced by the generator, which further does some extra computations
+		v := i * i
+		fmt.Println(v)
+	}
+}