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CHAPTER 5 ■ MEMBER INHERITANCE 160 Figure 5–9. Any instance of VanillaBean, Coffee, Chocolate, or MintChocolateChunk shares the heavyCream array, [1, "cup", "Organic Valley"]. What are the implications of sharing inherited members? Changing an inherited member immediately changes all instances, both old and new, that inherit it. If you’re thinking this would make it easier to look after your code when something has to change, I owe you a Smiley Cookie! Modifying New and Past Instances of a Type Now then, if we modify, add, or delete a member in MintChocolateChunk.prototype, Chocolate.prototype, Coffee.prototype, or VanillaBean.prototype, the change will be evident in any instance, both new and old, that inherits the member. So for example, if we change MintChocolateChunk.prototype.bittersweet[2] from "Callebaut" to "Lindt" after creating mintChocolateChunk, its bittersweet member reflects the change as Figure 5–10 displays: var VanillaBean = function(vanilla, cinnamon) { this.vanilla = [1, "bean", vanilla ? vanilla : "Madagascar Bourbon"]; cinnamon && (this.cinnamon = [1, "stick", "Saigon"]); }; VanillaBean.prototype = { heavyCream: [1, "cup", "Organic Valley"],
halfHalf: [2, "cup", "Organic Valley"], sugar: [5/8, "cup"], yolks: [6] }; var Coffee = function(coffee) { this.coffee = coffee || [1/4, "cup, coarsely ground", "Starbucks Espresso"]; }; Coffee.prototype = new VanillaBean(); var Chocolate = function(cocoa, bittersweet) { this.cocoa = cocoa || [3/16, "cup", "Callebaut"]; this.bittersweet = bittersweet || [1 + 1/2, "cup", "Callebaut"]; }; Chocolate.prototype = new VanillaBean(); Chocolate.prototype.yolks = [4]; var MintChocolateChunk = function(mint) { this.mint = mint || [1, "cup", "fresh mint leaves"]; }; MintChocolateChunk.prototype = new Chocolate(); MintChocolateChunk.prototype.vanilla = [1/3, "bean", "Madagascar Bourbon"]; MintChocolateChunk.prototype.bittersweet[0] = 1; delete MintChocolateChunk.prototype.cocoa; var mintChocolateChunk = new MintChocolateChunk(); console.dir(mintChocolateChunk); MintChocolateChunk.prototype.bittersweet[2] = "Lindt"; console.dir(mintChocolateChunk); CHAPTER 5 ■ MEMBER INHERITANCE Figure 5–10. Changing MintChocolateChunk.prototype.bittersweet[2] from "Callebaut" to "Lindt" after creating mintChocolateChunk still changes its bittersweet member. 161
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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 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 6 ■ FUNCTIONS AND ARRAYS
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CHAPTER 7 ■ TRAVERSING AND MODIFY
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CHAPTER 8 ■ SCRIPTING CSS 308 Rem
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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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