fat arrows section finished:

Author: enuber

app/index.js

@@ -29,7 +29,7 @@ double(8);
 //with a single argument coming in, you can also omit the () around it. like the following
 // const double1 = number => return 2 * number;
 //
-// double1(8);got a
+// double1(8);
 
 const numbers = [1,2,3];