Functions
When programming, you might find yourself using the same chunks of code repeatedly either by copying and pasting them or by rewriting the same lines of ActionScript. There is a way to write ActionScript just once and reuse it any time with a single action. You do this with functions, and the action by which you execute a function is a call or a function call. Functions are real time-saversduring both development and code maintenancebecause they reduce the amount of code you need to write or modify. Think of a function as a mini-program that serves a specific purpose within another application. You can use it to perform a set of specific actions, you can feed it information and output a resultor you can do both. Functions provide a powerful and versatile way to script your project.
You will create several functions that allow you to turn a Flash-TV on and off and change its channels. A Flash-TV is a simple Flash app that acts like a TV and remote control. 
In this lesson, you'll learn how to create and use functions while developing a remote control for a Flash-made television set.
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