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Taming JavaScript with Cloud9 IDE: a Tale of Tree Hugging Zef Hemel (@zef)
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.js
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browser.js
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db.js
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server.js
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*.js
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~140,000
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Tooling matters
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JavaScript Developer
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HTML CSS JavaScript
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HTML5 CSS3 JavaScript Client
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HTML5 CSS3 JavaScript Client Node.js Redis Server
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HTML5 CSS3 JavaScript Client Node.js Redis Server XMLHttpRequest HTML5 WebSockets
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Mozilla Bespin
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Mozilla Bespin Canvas
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Browser Wars 2.0
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DOM
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Sidebar
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JavaScript C/C++ Closure CoffeeScript Coldfusion C# CSS Groovy HTML Java JSON LaTeX Lua Markdown OCaml Perl PHP Ruby Scad Scala SCSS SQL SVG Textile XML
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~240,000
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Component Systems Message Queues Decoupling
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Tooling matters especially for JavaScript
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Unleash the awesome power of...
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tatic
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program analysis
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Iterating using undeclared variable
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Warning: you are in an anonymous inner function with its own “this” pointer
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Did you mean “length”?
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“The most important thing I have done as a programmer in recent years is to aggressively pursue static code analysis.” John Carmack
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How?
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Parse Analyze
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Parser Code AST
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Abstract Syntax Tree a * 10 Parser Op Var Num “*” “a” “10”
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Zeon UglifyJS Narcissus Esprima language.js
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performance (speed/memory) AST datastructure traversal tools
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performance (speed/memory) AST datastructure traversal tools JavaScript specific
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treehugger.js
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“The JQuery of AST analysis.”
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treehugger.js
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treehugger.js Generic AST Data structure
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treehugger.js Generic AST Data structure Generic Traversals
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treehugger.js Generic AST Data structure Generic Traversals DSL with Pattern Matching
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treehugger.js Generic AST Data structure Generic Traversals DSL with Pattern Matching Language- Specific Parsers
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treehugger.js Generic AST Data structure Generic Traversals DSL with Pattern Matching Language- Specific Parsers JavaScript (UglifyJS-based)
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treehugger.js Generic AST Data structure Generic Traversals DSL with Pattern Matching Language- Specific Parsers JavaScript (UglifyJS-based)
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a * 10 Op Var Num “*” “a” “10”
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Op("*", Var("a"), Num("10")) Op Var Num “*” “a” “10”
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Op("*", Var("a"), Num("10")) ATerm Op Var Num “*” “a” “10”
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Constructors Lists Strings Var(_) [_, _] "hello" Placeholders x
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let’s play
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What can you do with it?
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Low-level tooling
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Intelligent code completion
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Complex refactoring
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Cloud
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Big data
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What if...
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Project 1 Project 2 Project 3 Project 4 Project 5 Project 6
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Your (dev) environment matters use static analysis tools
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http://c9.io @zef http://github.com/ajaxorg/treehugger