java barcode generator example Arrays in Java

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CHAPTER 4 Arrays
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done using an array by using the reverse() method to reverse the order of values in the array Here s how you call the reverse() method:
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ToDoListreverse()
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And here s how the ToDoList array looks after the reverse() method is called:
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ToDoList[0] = "Wake up from your dream" ToDoList[1] = "Leave word at the White House that you won't be available for dinner" ToDoList[2] = "Give the Donald a call and invite him to your party"
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Some of us prefer to jump to the last task rather than work our way through a long list of things to do This, too, can be accomplished with an array by using the pop() method The pop() method returns and removes the last element of the array Here s how this is done:
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var task = ToDoListpop()
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Here s the array after the pop() method is called:
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ToDoList[0] = "Wake up from your dream" ToDoList[1] = "Leave word at the White House that you won't be available for dinner"
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In this chapter, you learned how to group together values by using an array An array has a name and one or more elements Elements are used similarly to how variables are used in a JavaScript Each element is identi ed by an index The rst element is index 0, the second element is index 1, and so on A value can be assigned to an element in two ways: by placing values between the parentheses of the Array() constructor when the array is declared or by using the assignment operator in a JavaScript statement You can determine the number of elements in an array by using the length property of the array object The length property is accessed by specifying the name of the array followed by a dot and the word length You can access the value of an element by specifying the name of the array followed by the index of the element within square brackets If you need to access all elements of the array, then use a for loop The initializer of a for loop (see 3) is used as the index for the array elements
JavaScript Demysti ed
The array object has several methods that you can use to manipulate elements of the array For example, the sort() method places elements in sorted order The slice() method takes a sequence of elements and uses them to create a new array The concat() method and join() method transform elements into a string And you can remove, insert, and reorganize elements by using the shift(), push(), reverse(), and pop() methods You now have a good working knowledge of how to store and use information within a JavaScript In the next chapter, you ll use this knowledge to create sophisticated forms that are used to retrieve and display information on the user s screen
Quiz
1 True or False This is the rst element of the products array: products[1] a True b False 2 How many elements are there in this array
Products = new Array('Soda','Beer','Pizza')
a 2 b 3 c 4 d None 3 What method would you use to create a string from array elements and separate those elements with a hyphen a shift() b join() c concat() d strjoin() 4 What method is used to remove an element from the bottom of an array a push() b pop() c reverse() d shift()
CHAPTER 4 Arrays
5 What method is used to remove the rst element from an array a push() b pop() c reverse() d shift() 6 What method is used to place a new element at the end of an array a push() b pop() c reverse() d shift() 7 True or False The sort() method only places text in sorted order a True b False 8 True or False The length of an array is equal to the index of the last element of the array a True b False 9 True or False An array element can be used the same way as a variable is used in a JavaScript a True b False 10 What method is used to create a new array using elements of another array a slice() b div() c splice() d shift()
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