Uploaded byChris Farrell
JavaScript: The Good Parts
The document summarizes aspects of JavaScript as "The Awful", "The Bad", and "The Good". "The Awful" parts include issues with global variables, block scoping, semi-colon insertion, string and number handling. "The Bad" parts discuss problems with equality operators, eval, and other language features. "The Good" parts highlight useful JavaScript features like functions, dynamic typing, object literals, closures, and inheritance patterns.
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JavaScript: The Good Parts
- 1.
- 2. The Awful no linker= global vars are required and global vars are very, very bad there is block syntax, but not block scope semi-colon insertion most reserved words are not used
- 3. The Awful 16-bit strings typeof parseInt + binaryfloating point
- 4. The Awful NaN Phony Arrays FalsyValues hasOwnProperty Object
- 5. The Bad == and!= with eval Function setTimeout and setInterval (string arg version)
- 6. The Bad continue switch fallthroughs blockless statements ++ and -- bitwise operators
- 7. The Bad function: declarationvs. expression typed wrappers new void /* block comments */
- 8. The Good functions loose typing dynamicobjects literals number
- 9. The Good function objectness functioninvocation patterns method, function, constructor, apply function arguments function return
- 10.
- 11. The Good curry memoization (cache) inheritance pseudoclassical object specifiers prototypal functional parts