[JavaScript]Enumerator Object

늘 한글 사이트에서만 검색해서 쓰고 MSDN을 잘 사용하지 않던나..
Google, Naver에 물어보면 다나오니.. ^^;;
바쁜일도 없고 너무 심심해서 MSDN을 열심히 뒤지고 있답니다..

Enumerator 는 쉽게 말해서 Array 대신에 index를 쓰지 않고 Next 를 이용해서 쓸 수 있다는 장점이 있습니다.
심플하게 매핑을 할것이라면 Array 보다 유용하게 쓰이겠네요.. (인데스 필요 없는 경우.. )

[출처] MSDN
http://msdn.microsoft.com/en-us/library/6ch9zb09(VS.85).aspx

JScript

Enumerator Object (Windows Scripting - JScript)

Updated: November 2007

Enables enumeration of items in a collection.

enumObj = new Enumerator([collection]) 

 Arguments

enumObj

Required. The variable name to which the Enumerator object is assigned.

collection

Optional. Any Collection object.

 Remarks

Collections differ from arrays in that the members of a collection are not directly accessible. Instead of using indexes, as you would with arrays, you can only move the current item pointer to the first or next element of a collection.

The Enumerator object provides a way to access any member of a collection and behaves similarly to the For...Each statement in VBScript.

 Example

The following code shows the usage of the Enumerator object:

Copy Code

function ShowDriveList(){
   var fso, s, n, e, x;                     //Declare variables.
   fso = new ActiveXObject("Scripting.FileSystemObject");
   e = new Enumerator(fso.Drives);          //Create Enumerator on Drives.
   s = "";
   for (;!e.atEnd();e.moveNext())           //Enumerate drives collection.
      {
         x = e.item();
         s = s + x.DriveLetter;
         s += " - ";
         if (x.DriveType == 3)              //See if network drive.
            n = x.ShareName;                //Get share name
         else if (x.IsReady)                //See if drive is ready.
            n = x.VolumeName;               //Get volume name.
         else
            n = "[Drive not ready]";
         s +=  n + "<br>";
      }
   return(s);                               //Return active drive list.
}

 Properties

The Enumerator object has no properties.

 Methods

atEnd Method | item Method | moveFirst Method | moveNext Method

 Requirements

Version 3