Merge pull request EbookFoundation#1470 from alesegdia/master

Added Sorella's Understanding JS OOP article.
carlosdiaz · May 10, 2015 · 1d6c0d1 · 1d6c0d1
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diff --git a/free-programming-books.md b/free-programming-books.md
@@ -1176,6 +1176,7 @@ Original Source: [Free Programming books](https://stackoverflow.com/revisions/392
 * [The JavaScript Tutorial](https://javascript.info/)
 * [The Problem with Native JavaScript APIs](https://chimera.labs.oreilly.com/books/1234000001655) (PDF)
 * [Understanding ECMAScript 6](https://leanpub.com/understandinges6/read) *(Leanpub, by Nicholas C. Zakas)*
+* [Understanding JavaScript OOP](https://robotlolita.me/2011/10/09/understanding-javascript-oop.html) *(Sorella)*
 * [You Don't Know JS](https://github.com/getify/You-Dont-Know-JS)