var a = ["1", "2", "3"];
var b = ["11", "12", "13"];
// Add an element to an array
Array.add(a, "4");
Sys.Debug.trace(a);
// Output: 1,2,3,4

// Add a range of elements to an array
Array.addRange(a, ["5", "6"]);
Sys.Debug.trace(a);
 // Output: 1,2,3,4,5,6

// Clone an array
var c = Array.clone(a);
Sys.Debug.trace(a);
// Output: 1,2,3,4,5,6

// Clear an array
Array.clear(c);
Sys.Debug.trace(c);
// Output:

// Check to see if an array has an element
         Sys.Debug.trace(Array.contains(a,"3"));
// Output: true

// Dequeue the last element from an array
Sys.Debug.trace(Array.dequeue(a));
// Output:  1

// Apply a function to all the elements of an array
Array.forEach(a,function(element, i, array){
Sys.Debug.trace("Array[" + i + "]=" + element);
});
// Output: Array[0]=2
Array[1]=3
Array[2]=4
Array[3]=5
Array[4]=6
// Search an element in an array
Sys.Debug.trace(Array.indexOf(a,"5",2));
// Output:  3

// Insert an element in an array at a specified position
Array.insert(a,3,"8");
Sys.Debug.trace(a);
// Output: 2, 3, 4, 8, 5, 6

// Parse a string and return an array
Sys.Debug.trace(Array.parse('["0","1","2"]'));
// Output : 0, 1, 2

// Remove an element from an array
Array.remove(a, "1");
Sys.Debug.trace(a);
// Output : 2, 3, 4, 8, 5, 6

// Remove an element at a specified position from an array
Array.removeAt(a,2);
Sys.Debug.trace(a);
// Output : 2, 3, 8, 5, 6

var bool = Boolean.parse("true");
         Sys.Debug.trace(bool);
// Output: true

// Displays the current date using the InvariantCulture object
Sys.Debug.trace ((new Date()).format("F"));
// Output: Friday, May 18, 2007 4:58:36 PM


// Displays the current date using the CurrentCulture object set for
French
Sys.Debug.trace((new Date()).localeFormat("F"));
// Output: vendredi 18 mai 2007 17:03:47


// Parse a string date using two date formats from InvariantCulture
object. The first format is skipped and the second one is choosed
Sys.Debug.trace(Date.parseInvariant("05/17/2007","MM-dd-yyyy","MM/dd/
yyyy"));
// Output: Thu May 17 00:00:00 UTC+0300 2007


// Parse a string date using the predefined short date format from
French CurrentCulture object. The short date pattern is dd/MM/yyyy
Sys.Debug.trace(Date.parseLocale("17/05/2007","d"));
// Output: Thu May 17 00:00:00 UTC+0300 2007

http://msdn2.microsoft.com/en-us/library/44e531aa-1383-48ad-887b-
fa15d81566c3.aspx

    // This example shows how the same value is parsed using the
    InvariantCulture and the French CurrentCulture.
    var a = Number.parseInvariant("2.55");
    var b = Number.parseLocale("2,55");
    Sys.Debug.trace(a + b);

    // Output: 5.1

var array = ["1","2"];
Sys.Debug.trace (Object.getTypeName(array));
// Output: Array

// Trim a string
          var str = " My text ";
         Sys.Debug.trace(str.trim());
// Output:My text

         // Left trim a string
         var str = " My text ";
         Sys.Debug.trace(str.trimStart());
// Output:My text

          // Right trim a string
          var str = " My text ";
          Sys.Debug.trace(str.trimEnd());
// Output: My text

         // Test to see if a string starts with another string
         var str = "test string";
         Sys.Debug.trace(str.startsWith("tes"));
// Output:true

         // Test to see if a string ends with another string
         var str = "test string";
         Sys.Debug.trace(str.endsWith("tes"));
// Output:false

         // Format a string based on the arguments using the
            InvariantCulture object
          Sys.Debug.trace(String.format("On {0:F} the market share is
                                            {1:p}",new Date(),23.24));
// Output:On Friday, 18 May 2007 20:35:33 the market share is 23.24 %
         // Format a string based on the arguments using the
            CurrentCulture object
          Sys.Debug.trace(String.localeFormat("On {0:F} the market
                                share is {1:p}",new Date(),23.24));
// Output: On vendredi 18 mai 2007 20:35:33 the market share is
23,24 %