The golden rule of programming is make your code as concise as possible. Functions enable you to reach that goal by enabling you to avoid rewriting the same piece of code multiple times within your program. Functions allow you to define a set of commands at the beginning of a program and reuse it many times later on with only one line of code. Defining functions requires a programmer to be conscious of a variable’s scope, or the range at which a variable can be accessed with in a program. Accordingly, we are also discussing scope in this video.
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