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CHAPTER 4 ■ CONTROLLING FLOW 120 Figure 4–9. Culling elements containing "" or undefined from looseLeafTea Replacing Break with Return in a Function Now just as you can abort a switch with return rather than break whenever the switch appears in a function, you can abort a loop (while, do while, for, for in) with return rather than break whenever the loop appears in a function. So, click Clear in both Firebug panels, and let’s rewrite our while loop inside a function, replacing break with return: var looseLeafTea = [ "Ghillidary", "Kenilworth", "Milima", "Keemun", "Boisahabi", "Manohari", "Borpatra", "Lukwah", "Khongea" ]; function findTea(tea) { var i = 0; while (i < looseLeafTea.length) { if (looseLeafTea[i] === tea) { return "cheery";
} else if (! looseLeafTea[i]) { looseLeafTea.splice(i, 1); continue; } else { i ++; } } return "glum"; } "I feel " + findTea("Kenilworth") + "!"; // "I feel cheery!" As Figure 4–10 illustrates, invoking our function findTea() evaluates to "cheery" or "glum" depending upon whether JavaScript can find the value of the tea parameter in looseLeafTea. Figure 4–10. Inside a function, you can abort a while loop with a return statement. ■ Note Chapter 6 covers functions more fully. CHAPTER 4 ■ CONTROLLING FLOW 121
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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 30 St
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CHAPTER 2 ■ TYPE CONVERSION 32 De
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CHAPTER 2 ■ TYPE CONVERSION 38
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CHAPTER 2 ■ TYPE CONVERSION 50 Co
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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 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 8 ■ SCRIPTING CSS 312 tex
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CHAPTER 8 ■ SCRIPTING CSS 314 Fig
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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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