Learn Swift Programming Syntax

Swift Basics

Get familiar with Swift types and operators, and develop deftness in defining variables and constants.

Optionals

The optional type is specific to Swift: declare explicitly and implicitly unwrapped optionals; unwrap optionals using optional binding and optional chaining.

Collections

Learn about Dictionaries, Arrays, and Sets and perform basic operations including: append, count, insert, remove, update, find, and retrieve.

Control Flow

Practice fast iteration with for-in loops by iterating through items in Arrays and Dictionaries, also learn how Swift handles if-else and switch statements.

Functions

Define and call functions, correctly using local and external parameters; identify parameter types and return types.

Classes, Properties, and Methods

Practice building custom classes with their own properties and methods.

Enums and Structs

Learn the difference between value types and references types and practice choosing when to use enums, structs, and classes.

Protocols and Extensions

Learn how protocols and extensions help keep your code DRY. Given code snippets, fix compiler errors by conforming to and implementing appropriate protocols.

Closure Expressions

Practice using Swift closures with the functions, sorted() and filter(). You'll also learn shorthand to make your closure expressions super concise.