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CHAPTER 6 FUNCTIONS AND ARRAYS
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[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]]; pirates.join("\n");
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Figure 6 35. Gluing elements together with join()
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Taking a Slice of an Array
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Sometimes you will want to copy two or more elements from an array. To do so, you would invoke its slice() method, passing two parameters. First, the index of the first element to copy. Second, the number of elements to copy.
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CHAPTER 6 FUNCTIONS AND ARRAYS
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Note slice() makes a shallow copy of an array. That is to say, elements containing object, array, and function values are copied by reference, not duplicated.
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So, say we d like to know how the Pirates did during the past five years, we d invoke slice() on pirates and pass 0 and 5. As Figure 6 36 displays, slice() returns copies of those five seasons, but does not remove them from pirates. 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.slice(0, 5)); pirates.length; // 18
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Figure 6 36. Shallow copying elements from an array with slice()
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CHAPTER 6 FUNCTIONS AND ARRAYS
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Converting a Read-only Array-like Object to an Array
slice() is commonly borrowed by read-only array-like objects such as arguments in order to copy their elements to a real, read-write array. To very simply illustrate this technique, let s create a function named argumentsToArray() that will copy elements from its arguments object to an array and then return that array. Then if we pass 18 parameters to argumentsToArray(), one for each losing season in the Pirates streak of futility, those will first get saved to its arguments object. Then we ll have arguments borrow slice(), which will return a real array containing 18 elements, one for each losing season. Therefore, if we save the return value of argumentsToArray() to a variable named pirates, it will contain the very same array we ve been mucking around with in this chapter as Figure 6 37 displays. var argumentsToArray = function () { return Array.prototype.slice.call(arguments); }; var pirates = argumentsToArray([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);
CHAPTER 6 FUNCTIONS AND ARRAYS
Figure 6 37. Shallow copying members from arguments to an array by borrowing slice(). Or more succinctly, we can borrow slice() from an empty array literal rather than from Array.prototype. As Figure 6 38 displays, this works just as well and saves some keystrokes. Consequently, borrowing slice() this way is very common. var argumentsToArray = function () { return [].slice.call(arguments); } var pirates = argumentsToArray([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);
CHAPTER 6 FUNCTIONS AND ARRAYS
Figure 6 38. A more succinct way of creating an array from the members in arguments So argumentsToArray() invoked the array method slice() on the arguments object, which is like the arg object below, but read-only. Then, insofar as we did not pass an index to begin the slice at the number of elements to copy, slice() copies every element in arguments and returns those in an array. This works for the reason that any member in an object named with a non-negative integer string is really an element. So while an object like arguments does not inherit any array methods, it can contain elements. So slice() copies the members named "0" through "17", but not the one named "length" or "callee". Pretty cool, don t you think var arg = { "0": [2010, 57, 105], "1": [2009, 62, 99], "2": [2008, 67, 95], "3": [2007, 68, 94], "4": [2006, 67, 95], "5": [2005, 67, 95], "6": [2004, 72, 89], "7": [2003, 75, 87], "8": [2002, 72, 89], "9": [2001, 62, 100], "10": [2000, 69, 93], "11": [1999, 78, 83], "12": [1998, 69, 93], "13": [1997, 79, 83], "14": [1996, 73, 89], "15": [1995, 58, 86],
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