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CHAPTER 6 ■ FUNCTIONS AND ARRAYS 212 fn = function () { return that.apply(this instanceof that ? this : obj, ossify.concat([].slice.call(arguments, 0))); }; fn.prototype = Object.create(that.prototype); return fn; }; var WildMaineBlueberry = function(blueberries, lemon, vanilla) { this.blueberries = [2, "cup", blueberries ? blueberries : "fresh wild Maine blueberries"]; this.freshLemonJuice = [2, "tsp", lemon ? lemon : "Meyer"]; this.vanilla = [1, "bean", vanilla ? vanilla : "Madagascar Bourbon"]; }; WildMaineBlueberry.prototype = { heavyCream: [1, "cup", "Organic Valley"], halfHalf: [1, "cup", "Organic Valley"], sugar: [5/8, "cup"], yolks: [6] }; var WinterWildMaineBlueberry = WildMaineBlueberry.bind(null, "Dole frozen wild blueberries", "Eureka"); var iceCream = new WinterWildMaineBlueberry("Tahitian"); console.dir(iceCream);
CHAPTER 6 ■ FUNCTIONS AND ARRAYS Figure 6–11. WinterWildMaineBlueberry() is created by combining WildMaineBlueberry() and its blueberries and lemon parameters. Chaining Methods If you save a function to an object, the function is referred to as a method. Moreover, within the body of the method, this refers to the object you saved the method to. So, when you invoke a function as a constructor, this refers to the object the constructor returns, but when you invoke a function as a method, this refers to the object containing the function. Finally, if you invoke a function traditionally as a global method, then this refers to the global object window. However, ECMAScript 5 changes the value of this to null from window to prevent your coming to grief if you forget to invoke a constructor with new. So anyway, to illustrate the point let’s use Object.create() to create an object named iceCream that inherits methods named _french(), _vanilla(), and _coffee() from another object named churn. Then 213
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THE EXPERT’S VOICE ® IN WEB DEVE
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ii JavaScript for Absolute Beginner
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iv Contents at a Glance ■Contents
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■ CONTENTS vi ■Chapter 2: Type
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■ CONTENTS viii Sharing a Prototy
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■ CONTENTS x Querying Attributes
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■ CONTENTS xii Getting the User
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■ CONTENTS xiv About the Technica
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■ PREFACE xvi Preface In the 2005
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■ PREFACE xviii Opening Firebug L
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■ PREFACE xx Now press Return on
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■ PREFACE xxii editor reappear. N
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■ PREFACE xxiv
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CHAPTER 1 ■ REPRESENTING DATA WIT
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CHAPTER 2 ■ TYPE CONVERSION 26 Fi
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CHAPTER 2 ■ TYPE CONVERSION 54 To
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CHAPTER 3 ■ OPERATORS 58 Remember
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CHAPTER 3 ■ OPERATORS 60 Using Ja
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CHAPTER 3 ■ OPERATORS 62 dough.po
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CHAPTER 3 ■ OPERATORS 64 mincedLe
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CHAPTER 3 ■ OPERATORS 66 Figure 3
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CHAPTER 3 ■ OPERATORS 68 // 1.25
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CHAPTER 3 ■ OPERATORS 72 The impo
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CHAPTER 3 ■ OPERATORS 76 } }; pur
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CHAPTER 3 ■ OPERATORS 78 saigonCi
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CHAPTER 3 ■ OPERATORS 82 loganber
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CHAPTER 3 ■ OPERATORS 94 fridge.y
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CHAPTER 4 ■ CONTROLLING FLOW 98 s
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CHAPTER 4 ■ CONTROLLING FLOW 100
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CHAPTER 5 ■ MEMBER INHERITANCE 14
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CHAPTER 7 ■ TRAVERSING AND MODIFY
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CHAPTER 8 ■ SCRIPTING CSS 308 Rem
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CHAPTER 8 ■ SCRIPTING CSS 312 tex
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CHAPTER 8 ■ SCRIPTING CSS 336 Why
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CHAPTER 8 ■ SCRIPTING CSS 346
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CHAPTER 9 ■ LISTENING FOR EVENTS
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■ INDEX 462 parsing an XML respon
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■ INDEX 464 creating, 217 queryin
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■ INDEX 466 document.styleSheets,
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■ INDEX 468 listening for mousedo
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■ INDEX 470 chaining prototypes,
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■ INDEX 474 ■ P padJSON(), 445
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■ INDEX 476 ten.js, 401 ternary o
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