What is a function?
Going back to Chapter 1, What is Programming?, you may remember that we defined programming as writing a set of instructions for a computer to execute. A function is a block of reusable code or instructions which generally performs a single specific task. A function abstracts one or more instructions and gives us a reference to that block of instructions. Chapter 4, Favorite Things, showed us how to reference values using variables. In this chapter, you will learn that a function is basically a set of instructions or a chunk of code that is grouped together and referenced by a function name.
Let's imagine a real-world example for a moment. When you want to order a pizza, you call your local pizza joint. The people working at ...
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