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CHAPTER 3 ■ OPERATORS 90 Figure 3–23. Chaining && and || expression to do a complex comparison To better illustrate the JavaScript’s lazy evaluation of || and &&, let’s replace the final comparison with an alert() call that would say “Don’t panic!” Now click Run in Firebug. Firebug does not open an alert dialog box because JavaScript never bothered to invoke alert(). var muffin = { oatFlour: [1/3, "cup"], barleyFlour: [1/3, "cup"], pastryFlour: [1 + 1/3, "cup"], freshlyGroundNutmeg: [1/4, "tsp"], saigonCinnamon: [1/2, "tsp"], seaSalt: [1/4, "tsp"], soda: [1, "tsp"], tartar: [1, "tsp"], mapleBrownCow: [1 + 1/2, "cup"], boysenberries: [2, "cup"], choppedPecans: [1/3, "cup"] }; muffin.mapleBrownCow[0] < muffin.boysenberries[0] && muffin.oatFlour[0] === muffin.barleyFlour[0] || muffin.freshlyGroundNutmeg[0] < muffin.saigonCinnamon[0] && muffin.choppedPecans[0]
CHAPTER 3 ■ OPERATORS return value based on the boolean its first operand evaluates or converts to. If the first operand evaluates to or converts to true: • || returns its first operand. • && returns its second operand. • ?: returns its second operand. On the other hand, if the first operand evaluates to or converts to false: • || returns its second operand. • && returns its first operand. • ?: returns its third operand. Though all three operators can be used to conditionally return a value, the ?: conditional operator’s separation of the boolean condition from the possible return values make it the preferred way of doing so. Here’s a quick example: var first = 30; var second = 20; var result = first > second ? "first is larger" : "first is smaller"; result; //"first is larger" Here the first operand evaluates to true, so ?: returns its second operand. As you can see, the return value is not used as any part of the conditional test. If I’m making cranberry bread with buttermilk, I’d add 1/2 cup buttermilk as in the following dough object. Note that the leavening bubbles are created by soda reacting with citric acid in the orange juice, lactic acid in the buttermilk, and tartaric acid in the cream of tartar. Note too that for this recipe I like to go with Bob’s Red Mill organic hard white whole wheat flour. Though it contains as much fiber-rich bran and vitamin-rich germ as hard red, hard white wheat does have the bitter red tannins. Therefore, hard white whole wheat flour has a milder, sweeter flavor than hard red, making it ideal for sweet soda breads. var dough = { hardWhiteWholeWheatFlour: [2, "cup"], sugar: [1/3, "cup"], madagascarVanilla: [1, "tsp"], orangeZest: [1, "tbs"], soda: [1, "tsp"], tartar: [1, "tsp"], orangeJuice: [1/2, "cup"], buttermilk: [1/2, "cup"], egg: [1], cranberries: [2/3, "cup"] }; If I don’t have buttermilk and do have kefir, I’d add 9/16 cup kefir. Note that there are 16 tbsp. per cup, so 9/16 cup kefir means 1/2 cup plus 1 tbsp. var dough = { hardWhiteWholeWheatFlour: [2, "cup"], sugar: [1/3, "cup"], madagascarVanilla: [1, "tsp"], orangeZest: [1, "tbs"], soda: [1, "tsp"], 91
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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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CHAPTER 1 ■ REPRESENTING DATA WIT
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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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