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CHAPTER 6 ■ FUNCTIONS AND ARRAYS 230 Arrays Not only did Ben & Jerry’s churn Wild Maine Blueberry from 1990 to 1992, but my Pittsburgh Pirates made it to the NL championship series during those years, too. But in 1993, Wild Maine Blueberry was laid to rest, and Barry Bonds left for San Francisco, where he would set MLB marks for most MVP awards (7), homeruns in a season (73), and homeruns in a career (762). My Pirates then embarked on a streak of losing seasons, 18 as of this writing, unrivaled in the history of North American pro sports (MLB, NFL, NBA, NHL). So anyway, let’s explore some predefined array methods with an array of arrays representing the Pirates’ unenviable streak of futility, which we’ll assign to a variable named pirates. Note that these predefined methods are saved to Array.prototype. So every array inherits those methods by way of the prototype chain in the same way that our ice-cream objects inherited members like halfHalf and yolks from the prototype chain. var pirates = [[2010, 57, 105], [2009, 62, 99], [2008, 67, 95], [2007, 68, 94], [2006, 67, 95], [2005, 67, 95], [2004, 72, 89], [2003, 75, 87], [2002, 72, 89], [2001, 62, 100], [2000, 69, 93], [1999, 78, 83], [1998, 69, 93], [1997, 79, 83], [1996, 73, 89], [1995, 58, 86], [1994, 53, 61], [1993, 75, 87]]; ■ Note pirates is a valid JSON array. We’ll explore JSON, the popular Ajax data exchange format in Chapter 10. Plucking Elements from an Array Alright, to pluck the first element in pirates we’d invoke its shift() method. So, if we pass the return value of shift() to console.dir(), JavaScript will print the 2010 season for us in Firebug as Figure 6–24 displays. var pirates = [[2010, 57, 105], [2009, 62, 99], [2008, 67, 95], [2007, 68, 94], [2006, 67, 95], [2005, 67, 95], [2004, 72, 89], [2003, 75, 87],
[2002, 72, 89], [2001, 62, 100], [2000, 69, 93], [1999, 78, 83], [1998, 69, 93], [1997, 79, 83], [1996, 73, 89], [1995, 58, 86], [1994, 53, 61], [1993, 75, 87]]; console.dir(pirates.shift()); Figure 6–24. shift() removes and returns the first element in an array. CHAPTER 6 ■ FUNCTIONS AND ARRAYS Note that shift() modifies pirates, too, by shifting the contents down one place in the array every time it is invoked. This means that element 0 is removed, element 1 becomes element 0, and so on. So, after invoking shift() three times in a row, pirates has just 15 elements rather than 18 as Figure 6–25 displays. var pirates = [[2010, 57, 105], [2009, 62, 99], [2008, 67, 95], [2007, 68, 94], [2006, 67, 95], [2005, 67, 95], [2004, 72, 89], [2003, 75, 87], [2002, 72, 89], [2001, 62, 100], [2000, 69, 93], [1999, 78, 83], 7 231
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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 3 ■ OPERATORS 58 Remember
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CHAPTER 3 ■ OPERATORS 60 Using Ja
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CHAPTER 3 ■ OPERATORS 66 Figure 3
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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 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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