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Swift iOS Programming for Kids

You're reading from   Swift iOS Programming for Kids Help your kids build simple and engaging applications with Swift 3.0

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781787120747
Length 260 pages
Edition 1st Edition
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Authors (2):
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Steffen D. Sommer Steffen D. Sommer
Author Profile Icon Steffen D. Sommer
Steffen D. Sommer
Jim Campagno Jim Campagno
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Jim Campagno
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Toc

What is a function?


Going back to Chapter 1What 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 4Favorite 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 the pizza joint will then note down your order, put it into their queue of orders, make the pizza specified in your order and lastly, have it delivered to your address.

Actually, we can model these tasks as multiple functions:

  • A function to receive the...

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