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JavaScript: A Beginner s Guide
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constructor index input length prototype
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Refers to the constructor function used to create an instance of an object Used when an array is created by a regular expression match Used when an array is created by a regular expression match Contains a numeric value equal to the number of elements in an array Allows the addition of properties and methods to objects such as the JavaScript Array object
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Table 11-1 Properties of the Array Object
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The constructor property is mainly useful for informational purposes or for comparisons To access the property, you use the array name followed by the dot operator and the constructor keyword The following is the general syntax for using an Array object property:
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arraynameproperty
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You replace arrayname with the name of the array you need to have use the property, and you replace property with the property you wish to use So, to use the constructor property, you need to create an array so that you have an instance of the Array object to use Instead of creating a new array, the s_list array from earlier is used here, allowing you to use the following code:
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var s_list = new Array(4); windowalert(s_listconstructor);
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This would send an alert with the text function Array() { [native code] } (the constructor function of the array)
The index and input Properties
To understand the index and input properties, you first need to understand regular expressions (which are used to match text strings), which requires a lengthy explanation, as provided in 13 Discussion of the index and input properties will be saved for this chapter
The length Property
The length property returns a number that tells you how many elements are in an array
NOTE
The length property is useful later when you begin using loops to cycle through arrays You may need to know the length of the array (in case you add elements after the array is defined) to make the loop go through each element of the array
11: JavaScript Arrays
To use the length property, you use the name of the array and then add the length property afterward The following code shows an example of the length property being used to tell the viewer how many elements are in an array:
var s_list = new Array(4) s_list[0]="Thomas"; s_list[1]="Roger"; s_list[2]="Amber"; s_list[3]="Jennifer"; windowalert("The array has "+s_listlength+" elements");
This will send an alert that says The array has 4 elements to the viewer
The prototype Property
The prototype property allows you to add properties and methods to an object that already exists, such as the Array object By using this property, you can add properties to the object from outside the constructor function Keep in mind, however, that a change made with the prototype property affects each instance of an object that uses the same constructor function For example, if you decide that the Array object needs another property for one of your pages, you could use the prototype property to assign a new property using the following syntax:
Arrayprototypenew_property=default_value;
You would replace new_property with the name you wish to use for your new property and then replace default_value with a default value for that property So, if you want to add a new property named attitude to the Array constructor function on your page and give it a default value of cool , you could use code such as the following:
A new property is given to the Array object for this page A new array is created that will have the new property The value of the property is sent in an alert
Arrayprototypeattitude = "cool"; var s_list = new Array(); windowalert("This place is "+s_listattitude);
This will cause an alert to the viewer of the value of the new property In this case, the default value is used because you didn t change it (more on that soon) You need to remember that the addition of a property like this affects every array in the document afterward So, by adding the property in this way, every array on the page (or every page that uses the script if it is external) now has this new property that you can access The following code shows the use of the prototype property with two arrays on the page The first array alerts the default value of your new property, while the second array alerts the new value The following example shows how you can use the prototype property using the new attitude property:
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