Add Seeding And Generating Random Integers as a reason til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_647 TILs and counting..._
+_648 TILs and counting..._
 
 ---
 
@@ -473,6 +473,7 @@ _647 TILs and counting..._
 - [Multi-Argument Functions As Syntactic Sugar](reason/multi-argument-functions-as-syntactic-sugar.md)
 - [Pattern Match On Exceptions](reason/pattern-match-on-exceptions.md)
 - [Quickly Bootstrap A React App Using Reason](reason/quickly-bootstrap-a-react-app-using-reason.md)
+- [Seeding And Generating Random Integers](reason/seeding-and-generating-random-integers.md)
 - [String Interpolation With Integers And Sprintf](reason/string-interpolation-with-integers-and-sprintf.md)
 - [String Interpolation With Quoted Strings](reason/string-interpolation-with-quoted-strings.md)
 

reason/seeding-and-generating-random-integers.md

@@ -0,0 +1,20 @@
+# Seeding And Generating Random Integers
+
+It is easy enough to generate a series of random numbers using the `Random`
+module's `int` function.
+
+```reason
+Random.int(10);
+```
+
+This will generate a random integer between 0 and 9.
+
+You may notice that the randomness is the same each time you run your
+program. That is because you have fixed seed. To make sure you have a
+different seed each time your program runs, you can initialize the random
+number generator with something different at each run, such as the current
+time.
+
+```reason
+Random.init(int_of_float(Js.Date.now()));
+```