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ActionScript: The difference between Object and * (an asterisk)

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Jay Fields

Posts: 765
Nickname: jayfields
Registered: Sep, 2006

Jay Fields is a software developer for ThoughtWorks

ActionScript: The difference between Object and * (an asterisk)

Posted: Jun 3, 2008 8:39 AM

This post originated from an RSS feed registered with Ruby Buzz by Jay Fields.
Original Post: ActionScript: The difference between Object and * (an asterisk) Feed Title: Jay Fields Thoughts Feed URL: http://blog.jayfields.com/rss.xml Feed Description: Thoughts on Software Development	Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Jay Fields Latest Posts From Jay Fields Thoughts

If you've ever wondered what the difference is between the following two statements, you aren't alone.

var result:Object = sendRequest();
var result:* = sendRequest();

It's fairly hard to Google for the explanation, but Subhash Chandra Gupta recently pointed me to a good example.

The full article can be found in the Flex 3 Help.

The difference is that * (an asterisk) signifies that the object can be any type and typing something as an Object will require you to cast if you are compiling in strict mode. Here's a greatly simplified example to demonstrate.

function returnOne():Object {
    return 1;
}
var one:Number = returnOne(); // compiler error in strict mode

function returnTwo():* {
    return 2;
}
var two:Number = returnTwo(); // no compiler error in strict mode

Read: ActionScript: The difference between Object and * (an asterisk)

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