From 0e9b7337ab3a9f16d08b3808e26f12c99020278b Mon Sep 17 00:00:00 2001
From: Rahul <esrahulcool@gmail.com>
Date: Wed, 29 Jan 2020 18:09:27 +0530
Subject: [PATCH] Update go.md

Added the usage of WaitGroup in go
---
 go.md | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/go.md b/go.md
index 64d78347f7..74c7a969b7 100644
--- a/go.md
+++ b/go.md
@@ -395,6 +395,39 @@ v, ok := <- ch
 
 See: [Range and close](https://tour.golang.org/concurrency/4)
 
+### WaitGroup
+
+```go
+import "sync"
+
+func main() {
+  var wg sync.WaitGroup
+  
+  for _, item := range itemList {
+    // Increment WaitGroup Counter
+    wg.Add(1)
+    go doOperation(item)
+  }
+  // Wait for goroutines to finish
+  wg.Wait()
+  
+}
+```
+{: data-line="1,4,8,12"}
+
+```go
+func doOperation(item string) {
+  defer wg.Done()
+  // do operation on item
+  // ...
+}
+```
+{: data-line="2"}
+
+A WaitGroup waits for a collection of goroutines to finish. The main goroutine calls Add to set the number of goroutines to wait for. The goroutine calls `wg.Done()` when it finishes.
+See: [WaitGroup](https://golang.org/pkg/sync/#WaitGroup)
+
+
 ## Error control
 
 ### Defer