Added javascript data structures and algorithms (#4625)

* Added javascript data structures and algorithms * Update free-programming-interactive-tutorials-en.md
4 years ago · 65bd32f505
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 * [Codecademy jquery track](https://www.codecademy.com/learn/jquery)
 * [ES6 Interactive Guide](http://stack.formidable.com/es6-interactive-guide/#/)
 * [Functional Programming in Javascript](https://github.com/ReactiveX/learnrx)
+* [Javascript Algorithms and Data Structures Certification](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript) - freeCodeCamp
 * [Javascript interactive tutorial on CodeCademy](https://www.codecademy.com/learn/javascript)
 * [JavaScript interactive tutorial on CoderMania](http://www.codermania.com/javascript/lesson/1a/hello-world)
 * [Javascripting](https://github.com/sethvincent/javascripting)