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Author: name

README.md

@@ -62,6 +62,8 @@ Other Style Guides
 
 ## Types
 
+  Programming languages all have built-in data structures, but these often differ from one language to another. This article attempts to list the built-in data structures available in JavaScript and what properties they have. These can be used to build other data structures. Wherever possible, comparisons with other languages are drawn.
+
   <a name="types--primitives"></a><a name="1.1"></a>
   - [1.1](#types--primitives) **Primitives**: When you access a primitive type you work directly on its value.