Add Round Floats To Integers as an elixir til

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/).
 
-_472 TILs and counting..._
+_473 TILs and counting..._
 
 ---
 
@@ -99,6 +99,7 @@ _472 TILs and counting..._
 - [Quitting IEx](elixir/quitting-iex.md)
 - [Replace Duplicates In A Keyword List](elixir/replace-duplicates-in-a-keyword-list.md)
 - [Reversing A List](elixir/reversing-a-list.md)
+- [Round Floats To Integers](elixir/round-floats-to-integers.md)
 - [Run ExUnit Tests In A Deterministic Order](elixir/run-exunit-tests-in-a-deterministic-order.md)
 - [String Interpolation With Just About Anything](elixir/string-interpolation-with-just-about-anything.md)
 - [Updating Values In A Map](elixir/updating-values-in-a-map.md)

elixir/round-floats-to-integers.md

@@ -0,0 +1,28 @@
+# Round Floats To Integers
+
+The
+[`Float.round/2`](http://elixir-lang.org/docs/stable/elixir/Float.html#round/2)
+function allows you to round floating point numbers. The result is another
+floating point number.
+
+```elixir
+> Float.round(1.5)
+2.0
+> Float.round(1.3)
+1.0
+```
+
+If, instead, you always want an integer as the result of rounding, you can
+use `Kernel`'s version of a rounding function:
+
+```elixir
+> Kernel.round(1.5)
+2
+> Kernel.round(1.3)
+1
+```
+
+The
+[`Kernel.round/1`](http://elixir-lang.org/docs/stable/elixir/Kernel.html#round/1)
+function accepts both integers and floats, and always returns an integer.
+Additionally, it can be used in guard tests.