Recover in ActionScript

ActionScript doesn’t have built-in exception handling mechanisms like panic and recover. Instead, we can use try-catch blocks to handle exceptions. Here’s an equivalent implementation:

package {
    import flash.display.Sprite;
    import flash.events.Event;

    public class RecoverExample extends Sprite {
        public function RecoverExample() {
            addEventListener(Event.ADDED_TO_STAGE, init);
        }

        private function init(event:Event):void {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            main();
        }

        // This function throws an error
        private function mayThrowError():void {
            throw new Error("a problem");
        }

        private function main():void {
            try {
                mayThrowError();
                
                // This code will not run because mayThrowError throws an error.
                // The execution of main stops at the point of the error
                // and jumps to the catch block.
                trace("After mayThrowError()");
            } catch (error:Error) {
                // The catch block is similar to the deferred function in the original example.
                // It catches the error and allows the program to continue execution.
                trace("Recovered. Error:\n", error.message);
            }
        }
    }
}

In this ActionScript example:

We define a class RecoverExample that extends Sprite, which is typical for ActionScript applications.
The mayThrowError function throws an Error instead of using panic.
In the main function, we use a try-catch block to handle the error. This is equivalent to the defer and recover mechanism in the original example.
If an error occurs in mayThrowError, the execution immediately jumps to the catch block, similar to how the deferred function is called when a panic occurs in the original example.
The catch block prints the error message, allowing the program to continue execution instead of crashing.

To run this code, you would typically compile it into a SWF file and run it in a Flash Player or AIR runtime environment. The output would be:

Recovered. Error:
 a problem

This example demonstrates how to handle errors in ActionScript, allowing your program to recover from exceptions and continue execution, similar to the behavior of recover in the original example.

Defer in ActionScript

String Functions in ActionScript

Learn X By Example

Title here

Recover in ActionScript