JavaScript: The Good Parts by Douglas Crockford Publisher: O ...

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2 in all browsers. It is unfortunate that Java failed in that environment; if it hadn't, there could be a choice for people desiring a strongly typed classical language. But Java did fail and JavaScript is flourishing, so there is evidence that JavaScript did something right. The other answer is that, despite its deficiencies, JavaScript is really good. It is lightweight and expressive. And once you get the hang of it, functional programming is a lot of fun. But in order to use the language well, you must be well informed about its limitations. I will pound on those with some brutality. Don't let that discourage you. The good parts are good enough to compensate for the bad parts. 2
1.3. A Simple Testing Ground If you have a web browser and any text editor, you have everything you need to run JavaScript programs. First, make an HTML file with a name like program.html: Then, make a file in the same directory with a name like program.js: document.writeln('Hello, world!'); Next, open your HTML file in your browser to see the result. Throughout the book, a method method is used to define new methods. This is its definition: Function.prototype.method = function (name, func) { this.prototype[name] = func; return this; }; It will be explained in Chapter 4. 1 1
Page 1 and 2: JavaScript: The Good Parts by Dougl
Page 5 and 6: Section C.9. Expression Statements
Page 9 and 10: Dedication For the Lads: Clement, P
Page 11 and 12: Preface If we offend, it is with ou
Page 13 and 14: I want to thank the people I worked
Page 15 and 16: Chapter 1. Good Parts ...setting th
Page 17 and 18: Chapter 1. Good Parts ...setting th
Page 19: 1.2. Analyzing JavaScript JavaScrip
Page 23 and 24: Chapter 2. Grammar I know it well:
Page 25 and 26: Chapter 2. Grammar I know it well:
Page 27 and 28: 2.2. Names A name is a letter optio
Page 29 and 30: 2.3. Numbers JavaScript has a singl
Page 31 and 32: 2.4. Strings A string literal can b
Page 33 and 34: 2.5. Statements A compilation unit
Page 35 and 36: The switch statement performs a mul
Page 37 and 38: The try statement executes a block
Page 39 and 40: 2.6. Expressions The simplest expre
Page 41 and 42: Invocation causes the execution of
Page 43 and 44: 2.7. Literals Object literals are a
Page 45 and 46: 2.8. Functions A function literal d
Page 47 and 48: Chapter 3. Objects Upon a homely ob
Page 49 and 50: Chapter 3. Objects Upon a homely ob
Page 51 and 52: 3.2. Retrieval Values can be retrie
Page 53 and 54: 3.3. Update A value in an object ca
Page 55 and 56: 3.4. Reference Objects are passed a
Page 57 and 58: 3.5. Prototype Every object is link
Page 59 and 60: 3.6. Reflection It is easy to inspe
Page 61 and 62: 3.7. Enumeration The for in stateme
Page 63 and 64: 3.8. Delete The delete operator can
Page 65 and 66: 3.9. Global Abatement JavaScript ma
Page 67 and 68: Chapter 4. Functions Why, every fau
Page 69 and 70: Chapter 4. Functions Why, every fau
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4.2. Function Literal Function obje
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4.3. Invocation Invoking a function
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document.writeln(myQuo.get_status(
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4.4. Arguments A bonus parameter th
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4.5. Return When a function is invo
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4.6. Exceptions JavaScript provides
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4.7. Augmenting Types JavaScript al
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4.8. Recursion A recursive function
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4.9. Scope Scope in a programming l
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4.10. Closure The good news about s
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}; } } // END BAD EXAMPLE The add_t
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4.11. Callbacks Functions can make
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4.12. Module We can use functions a
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4.13. Cascade Some methods do not h
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4.14. Curry Functions are values, a
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4.15. Memoization Functions can use
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Chapter 5. Inheritance Divides one
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eturn s; }; Cat.prototype.get_name
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Chapter 5. Inheritance Divides one
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eturn s; }; Cat.prototype.get_name
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5.2. Object Specifiers It sometimes
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5.3. Prototypal In a purely prototy
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5.4. Functional One weakness of the
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}; for (i = 0; i < n; i += 1) { if
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5.5. Parts We can compose objects o
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Chapter 6. Arrays Thee I'll chase h
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Chapter 6. Arrays Thee I'll chase h
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6.2. Length Every array has a lengt
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6.3. Delete Since JavaScript's arra
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6.4. Enumeration Since JavaScript's
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6.5. Confusion A common error in Ja
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6.6. Methods JavaScript provides a
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6.7. Dimensions JavaScript arrays u
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Chapter 7. Regular Expressions Wher
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Regular expressions cannot be broke
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The $ represents the end of the str
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Chapter 7. Regular Expressions Wher
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Regular expressions cannot be broke
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The $ represents the end of the str
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7.2. Construction There are two way
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7.3. Elements Let's look more close
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The backslash character indicates e
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Code View: (?:!|"|#|\$|%|&|'|$|$|
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Chapter 8. Methods Though this be m
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array.slice(start, end ) The slice
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is not guaranteed to produce the co
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Function Number var a = ['a', 'b',
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Object RegExp The most common case,
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String // [3] regexp.test(string )
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it produces an array of all the mat
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is 'and' var c = text.slice(-5); //
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Chapter 9. Style Here is a silly st
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i = 0; // Set i to zero. In JavaScr
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Chapter 10. Beautiful Features Thus
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Appendix A. Awful Parts That will p
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Appendix A. Awful Parts That will p
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A.2. Scope JavaScript's syntax come
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A.3. Semicolon Insertion JavaScript
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A.4. Reserved Words The following w
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A.5. Unicode JavaScript was designe
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A.6. typeof The typeof operator ret
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A.7. parseInt parseInt is a functio
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A.8. + The + operator can add or co
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A.9. Floating Point Binary floating
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A.10. NaN The value NaN is a specia
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A.11. Phony Arrays JavaScript does
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A.12. Falsy Values JavaScript has a
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A.13. hasOwnProperty In Chapter 3,
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A.14. Object JavaScript's objects a
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Appendix B. Bad Parts And, I pray t
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Appendix B. Bad Parts And, I pray t
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B.2. with Statement JavaScript has
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B.3. eval The eval function passes
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B.4. continue Statement The continu
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B.5. switch Fall Through The switch
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B.6. Block-less Statements An if or
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B.7. ++ -- The increment and decrem
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B.8. Bitwise Operators JavaScript h
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B.9. The function Statement Versus
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B.10. Typed Wrappers JavaScript has
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B.11. new JavaScript's new operator
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B.12. void In many languages, void
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Appendix C. JSLint What error drive
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Appendix C. JSLint What error drive
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C.2. Members Since JavaScript is a
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C.3. Options The implementation of
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C.4. Semicolon JavaScript uses a C-
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C.5. Line Breaking As a further def
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C.6. Comma The comma operator can l
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C.7. Required Blocks JSLint expects
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C.8. Forbidden Blocks In many langu
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C.9. Expression Statements An expre
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C.10. for in Statement The for in s
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C.11. switch Statement A common err
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C.12. var Statement JavaScript allo
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C.13. with Statement The with state
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C.14. = JSLint does not expect to s
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C.15. == and != The == and != opera
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C.16. Labels JavaScript allows any
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C.17. Unreachable Code JSLint expec
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C.18. Confusing Pluses and Minuses
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C.19. ++ and -- The ++ (increment)
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C.20. Bitwise Operators JavaScript
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C.21. eval Is Evil The eval functio
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C.22. void In most C-like languages
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C.23. Regular Expressions Regular e
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C.24. Constructors and new Construc
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C.25. Not Looked For JSLint does no
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C.26. HTML JSLint is able to handle
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C.27. JSON JSLint can also check th
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C.28. Report If JSLint is able to c
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Appendix D. Syntax Diagrams Thou ma
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3 3
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5 5
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7 7
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9 9
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11 11
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Appendix E. JSON Farewell: the leis
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That's it. That is all of JSON. JSO
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Appendix E. JSON Farewell: the leis
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That's it. That is all of JSON. JSO
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E.2. Using JSON Securely JSON is pa
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E.3. A JSON Parser This is an imple
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}, } } error("Bad string"); white =
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} error("Syntax error"); // If ther
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Appendix. Colophon The animal on th
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Index [SYMBOL] [A] [B] [C] [D] [E]
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