100 Days of Swift

Swift review, day three

This is the final consolidation day for now, and is the last step before we start building real apps tomorrow. This time we’ll be reviewing access control, typecasting, closures, and more.

Today you have just five topics to review. Once you’ve completed them you can, if you want, go back over the tests from earlier days to improve on your scores.

Optional: once you’ve finished reviewing those, you can go back to the review page and go over the tests related to the topics above.

At this point, you now know enough about Swift that you should be looking to expand your learning material a little. Coming at the same topic from multiple angles will help round out your understanding, while also helping keep you up to date with future changes.

While there are lots of places you can try, I’d like to recommend the podcast I make with Sean Allen. It’s called Swift over Coffee, and we think it’s pretty awesome: it’s always 30 minutes or less, we always cover news and views from the community, and we always try to explain everything in a way that newcomers can follow. You can listen here

Bonus: find the Swifty words!

I’ve made a word search to help you test your knowledge of the most useful terms for Swift developers. You can download it as a PDF here, then use the clues below to figure out what words to look for. If you get stuck, try looking through my Swift glossary.

There are 50 in total, and words can go in all directions – good luck!

Fixed-size collection of values of any type
A custom type with cases and associated values
Makes a method shared across all instances of a class or struct
How we check for and extract the value inside an optional
Type that stores data as pairs of keys and values
Places variables into strings easily
Loop type commonly used to make infinite loops
A list of criteria that a type must conform to
Evaluates multiple conditions in one block of code
Special method that creates instances of structs and classes
Functions that accept one or more parameters of a specific type
Code to handle errors thrown by do
Value passed into a function
Unwrapping alternative to if let
Sends back a value from a function
A catch-all case for switch blocks
An anonymous function that you can pass around as data
A whole number
Telling Swift the specific type a variable should be
Question marks after optionals
Code that is triggered when properties change
May or may not exist
Keyword that lets function parameters be modified outside the function
Access control that restricts a property to being used only inside its type
Skips the rest of the current loop iteration
Loop that always executes at least once
The return type of a function that returns nothing
How we refer to the current instance of an object
Struct initializer that assigns values to all properties
The name for how values used in a closure are stored for later use
A variable attached to a struct or class
A type that spans values between two numbers
Special syntax for final parameter closures
Type that holds a large floating-point number
The name for math symbols like + and -
The ability to treat an object of one type as another type
Adds extra functionality to a type
The name for a function that exists inside a struct or class
Exits a loop immediately
Keyword for a function that can trigger errors
Key that lets us replace a method inherited from a superclass
When one class builds on another
Reads the length of a string
Apple's all-in-one code editing environment
Operator that takes three operands
Puts off work until later
Name for a method called before class destruction
Ordered collection of values stored in a single value
A class that cannot be inherited from
Holds either true or false

Need help? Tweet me @twostraws!

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DAY 15

Swift review, day three

Bonus: find the Swifty words!