Deluge Scripting Basic Use Case

Hello, I'm new to deluge scripting and I just need a bit of a foundation to start. I've created a really basic script for testing purposes:

// Check if the subject is 'Test'

if(requestObj.get("subject") == "Test")

{

// Update the subject to 'Updated'

requestObj.put("subject","Updated");

// Return a boolean (true) to confirm the update

return true;

}

else

{

// Return false if subject is not 'Test'

return false;

}

I just wanted to see if this script could affect the live environment. The script runs successfully but the value (the request/ticket) I select does not change. I know that I'm missing something, is it an API call of some sort? Some more information would be really helpful, thank you!