Associative arrays use strings in place of index numbers, to associate the value of the elements. These indexes must be specified by the programmer.
- The syntax to create an associative array is:
var array_name:Array = new Array();
 array_name['index1'] = value1;
 array_name['index2'] = value2;
 array_name['index3'] = value3;
- You can add as many elements as you want.
- You can use either single or double quotes for "index".

You can access or change the value of a specific element of an associative array the same as with a numeric indexed array, using its index:   array_name['index'].

• The elements of an associative array can also be accessed with the dot (.) operator:   array_name.index   (like the proprietes of an object).

Here's an example in which we apply both methods:
// associative array, with 3 elements
var m_ar:Array = new Array();
 m_ar['site'] = 'coursesweb.net';
 m_ar['course'] = 'Adobe Flash';
 m_ar['tutorials'] = 'ActionScript';

// Access the element with index 'site'
trace(m_ar['site']);         // coursesweb.net

// Access another element, using the dot (.) operator
trace(m_ar.course);           // Adobe Flash

Traverse associative Arrays

You can traverse an associative array with the for..in, or for each..in loop.

Example with for..in

// associative array, with 3 elements
var m_ar:Array = new Array();
 m_ar['site'] = 'coursesweb.net';
 m_ar['course'] = 'Adobe Flash';
 m_ar['tutorials'] = 'ActionScript';

// create a "for..in" loop to traverse the "m_ar" array
for(var key:String in m_ar)
{
  // displays in Output the index and the value of the current item
  trace('Index='+ key+ ' - value='+ m_ar[key]);

  // You can execute any operations with "key" si "m_ar[key]"
}
- key is a variable which stores the "index" of the current element (you can use any name for the variable).
In Output will display:
Index=site - value=coursesweb.net
Index=tutorials - value=ActionScript
Index=course - value=Adobe Flash

Example with for each..in

// associative array, with 3 elements
var m_ar:Array = new Array();
 m_ar['site'] = 'coursesweb.net';
 m_ar['course'] = 'Adobe Flash';
 m_ar['tutorials'] = 'ActionScript';

// create a "for each..in" loop to traverse the "m_ar" array
for each(var elm in m_ar)
{
  // displays in Output the value of the current item (stored in elm)
  trace('valE - '+ elm);

  // You can execute any operations with "elm"
}

• Notice the diferences between "for..in" and "for each..in". The "for each..in" loop doesn't get the index of the element. The "elm" store the element itself.
In Output will display:
valE - Adobe Flash
valE - coursesweb.net
valE - ActionScript

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Click on the HTML tag which creates an horizontal line in web page.
<br /> <em> <hr />
Some content ...
<hr />
Content under line ...
Which CSS property defines the text color?
font-style font-variant color
h2 {
  color: #cbdafb;
}
Click on the function which searches if a character, or text exists in a string.
indexOf() toString() split()
var str = "Web courses - http://CoursesWeb.net/";
if(str.indexOf("http://") == -1) alert("http:// isn`t in string");
else alert("http:// is in string");
Which function splits a string into an array of strings based on a separator?
array_merge() explode() implode()
$str = "apple,banana,melon,pear";
$arr = explode(",", $str);
var_export($arr);      // array (0=>"apple", 1=>"banana", 2=>"melon", 3=>"pear")
Associative Arrays in ActionScript

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