Class that contains static utility methods for manipulating and working with Arrays
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package com.adobe.utils
{
/**
* Class that contains static utility methods for manipulating and working
* with Arrays.
*
* Note that all APIs assume that they are working with well formed arrays.
* i.e. they will only manipulate indexed values.
*
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
public class ArrayUtil
{
/**
* Determines whether the specified array contains the specified value.
*
* @param arr The array that will be checked for the specified value.
*
* @param value The object which will be searched for within the array
*
* @return True if the array contains the value, False if it does not.
*
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
public static function arrayContainsValue(arr:Array, value:Object):Boolean
{
return (arr.indexOf(value) != -1);
}
/**
* Remove all instances of the specified value from the array,
*
* @param arr The array from which the value will be removed
*
* @param value The object that will be removed from the array.
*
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
public static function removeValueFromArray(arr:Array, value:Object):void
{
var len:uint = arr.length;
for(var i:Number = len; i > -1; i--)
{
if(arr[i] === value)
{
arr.splice(i, 1);
}
}
}
/**
* Create a new array that only contains unique instances of objects
* in the specified array.
*
* Basically, this can be used to remove duplication object instances
* from an array
*
* @param arr The array which contains the values that will be used to
* create the new array that contains no duplicate values.
*
* @return A new array which only contains unique items from the specified
* array.
*
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
public static function createUniqueCopy(a:Array):Array
{
var newArray:Array = new Array();
var len:Number = a.length;
var item:Object;
for (var i:uint = 0; i < len; ++i)
{
item = a[i];
if(ArrayUtil.arrayContainsValue(newArray, item))
{
continue;
}
newArray.push(item);
}
return newArray;
}
/**
* Creates a copy of the specified array.
*
* Note that the array returned is a new array but the items within the
* array are not copies of the items in the original array (but rather
* references to the same items)
*
* @param arr The array that will be copies
*
* @return A new array which contains the same items as the array passed
* in.
*
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
public static function copyArray(arr:Array):Array
{
return arr.slice();
}
/**
* Compares two arrays and returns a boolean indicating whether the arrays
* contain the same values at the same indexes.
*
* @param arr1 The first array that will be compared to the second.
*
* @param arr2 The second array that will be compared to the first.
*
* @return True if the arrays contains the same values at the same indexes.
False if they do not.
*
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
public static function arraysAreEqual(arr1:Array, arr2:Array):Boolean
{
if(arr1.length != arr2.length)
{
return false;
}
var len:Number = arr1.length;
for(var i:Number = 0; i < len; i++)
{
if(arr1[i] !== arr2[i])
{
return false;
}
}
return true;
}
}
}
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