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CHAPTER 4 Arrays
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Figure 4-3
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A partial list of phone numbers is displayed
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Combining Array Elements into a String
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At some point, you ll want to combine values of the array element into one string (You ll recall from 2 that a string is text) The following array illustrates:
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products[0] products[1] products[2] products[3] = = = = 'Soda ' 'Water' 'Pizza' 'Beer'
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Each array element contains a product name By combining the array elements, we create a string that looks like this:
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'Soda,Water,Pizza,Beer'
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Once the product names are combined into a string, we can display the string on a document (see 1) or on a JavaScript form (see 7)
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JavaScript Demysti ed
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Array elements can be combined in two ways: by using the concat() method or the join() method of the array object Both of these methods do practically the same thing that is, they concatenate copies of values of array elements Values of these elements remain untouched in the array However, there is a subtle difference between the concat() method and the join() method The concat() method separates each value with a comma The join() method also uses a comma to separate values, but you can specify a character other than a comma to separate values You do this by placing that character in the parentheses of the join() method Here s how to use the concat() method:
var str = productsconcat()
The value of str is
'Soda,Water,Pizza,Beer'
Here s how to use the join() method In this example, we use a space to separate values:
var str = productsjoin(' ')
The value of str in this case is
'Soda Water Pizza Beer'
The following JavaScript (see Figure 4-4) shows the concat() method and the join() method in action You can change the value in the join() method to any character that you want the browser to use to separate these values
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Display Array Elements Using concat() and join()</title> </head> <body> <script language="Javascript" type="text/javascript"> <!-var products = new Array() products[0] = 'Soda '
CHAPTER 4 Arrays
products[1] = 'Water' products[2] = 'Pizza' products[3] = 'Beer' var str = productsconcat() documentwrite(str) documentwrite('<br>') var str = productsjoin(' ') documentwrite(str) --> </script> <noscript> <h1> JavaScript Required</h2> </noscript> </body> </html>
Figure 4-4 Array elements are combined into strings using the concat() and join() methods
JavaScript Demysti ed
Changing Elements of the Array
Most of us are familiar with to-do lists New tasks are placed at the bottom of the list and eventually move to the top when all the other tasks ahead of it are completed and removed from the list An array can be used as a to-do list Here s how:
var ToDoList = new Array() ToDoList[0] = "Book the Waldorf for your birthday party" ToDoList[1] = "Give the Donald a call and invite him to your party" ToDoList[2] = "Leave word at the White House that you won't be available for dinner"
Suppose that you have booked the Waldorf, so you need to remove the rst task from the list You do this by calling the shift() method of the array object The shift() method removes and returns the rst element of the array and then moves the other tasks up on the list Here s how to call the shift() method:
var task = ToDoListshift()
Here s the ToDoList array after the shift() method is called:
ToDoList[0] = "Give the Donald a call and invite him to your party" ToDoList[1] = "Leave word at the White House that you won't be available for dinner"
You call the push() method of the array object to place a new task at the end of the to-do list You place the task that you want placed on the to-do list between the parentheses of the push() method, as shown here:
ToDoListpush("Wake up from your dream")
The push() method creates a new element at the end of the array and assigns the value that you place between the parentheses of the new element Here s what the array looks like after calling the push() method:
ToDoList[0] = "Give the Donald a call and invite him to your party" ToDoList[1] = "Leave word at the White House that you won't be available for dinner" ToDoList[2] = "Wake up from your dream"
There are times when we feel like working from the bottom of our to-do list, starting with the last task and working our way back to the rst task This is easily
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