Add Sleep For A Duration as a go til

Author: jbranchaud

README.md

@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_324 TILs and counting..._
+_325 TILs and counting..._
 
 ---
 
@@ -103,6 +103,7 @@ _324 TILs and counting..._
 
 - [Not So Random](go/not-so-random.md)
 - [Replace The Current Process With An External Command](go/replace-the-current-process-with-an-external-command.md)
+- [Sleep For A Duration](go/sleep-for-a-duration.md)
 
 ### javascript
 

go/sleep-for-a-duration.md

@@ -0,0 +1,25 @@
+# Sleep For A Duration
+
+Many languages allow you to sleep for a certain number of milliseconds. In
+those languages, you can give `500` or `1000` to the sleep function to
+sleep for half a second and a second respectively. In Go, the duration of a
+call to [`time.Sleep`](https://golang.org/pkg/time/#Sleep) is in
+nanoseconds. Fortunately, there are constants that make it easy to sleep in
+terms of milliseconds.
+
+For example, you can sleep for a half a second (500 milliseconds) like so:
+
+```go
+package main
+
+import (
+    "time"
+)
+
+func main() {
+    time.Sleep(500 * time.Millisecond)
+}
+```
+
+Other available time constants are `Nanosecond`, `Microsecond`, `Second`,
+`Minute`, `Hour`.