Are functions part of the course? Functions are both extremely practical for real world problems where code is repeated but with different values, as well as

Are functions part of the course? Functions are both extremely practical for real world problems where code is repeated but with different values, as well as of course being fundamental to the theory of computation. I very much enjoy introducing my pupils to functions. It is the first time they really get to use the computer as a tool for accelerating their abilities. Up until then, their code has utility in the order of how much they wrote. Functions can let you write a page of code that does so much more.