How To Use JScript .NET to Traverse Through a Collection (306570)

SUMMARY

Create an Application That Uses the "For...In" Syntax to Traverse Through a Collection

1. From the Windows Start menu, click Run, and then type notepad to open Notepad.
2. Copy the following code, right-click it, and then click Copy. In Notepad, click Paste on the Edit menu to insert the code into the document:

   import System;
   import System.Collections;
   
   var arlist : ArrayList;
   
   arlist = new ArrayList();
   arlist.Add("red");
   arlist.Add("blue");
   arlist.Add("green");
   for (var k : String in arlist)
   {
   	Console.WriteLine(k);
   }
   					

3. On the File menu, click Save.
4. In the Save As Type drop-down list box, click All Files. In the File Name text box, type Collection.js. Finally, click Save.
5. Compile the file from the command line. For example, type the following command at a command prompt:

   jsc.exe /out:collection.exe collection.js

6. Run the application.

Additional Information About the "For...In" Construction

• "Expando" properties of an object: Property names are enumerated. Expando properties are properties that can be added and removed dynamically at run time. To access expando properties, you must use the [" "] notation.
• All arrays: Indices are enumerated.
• Objects that implement the IEnumerable or IEnumerator interfaces: Whatever the enumerator returns is enumerated.