Learn Swift 4 with Bob: The Intermediate to Advanced Swift

Discover what makes Swift different from other languages, including its question mark and exclamation syntax. Learn generics, error handling, and guard to create a modern, safe, reusable code base.

Learn Swift error handling by separating concerns, using throw and do-catch, and choosing between try, try?, and try! to manage optionals and errors safely.

discover how subscripts enable concise access to array and dictionary values using brackets, returning values with optional handling and defaults, and why context matters for readable code.

Explore sets, arrays, and tuples in Swift 4, learn to eliminate duplicates, perform set operations like union and intersection, and convert between arrays and sets with mutating vs non-mutating methods.

Explore Swift property observers by adding willSet and didSet to a stored property, track old value and new value, and differentiate from computed properties through practical login and UI examples.

Master Swift closures by returning and passing closure blocks, both directly and indirectly. Learn closure syntax, including first-parameter brackets and the dollar sign for arguments.

Learn how to initialize objects with closures in Swift and why lazy initialization defers heavy work until needed, enabling dry, reusable UI components.

Master closures in Swift by passing and returning closure blocks to and from functions, create objects using closure blocks, and understand the lazy keyword and the unique behavior of closures.

Learn protocol extension to provide default implementations and write less code. See practical examples like GPA defaults and area calculations for rectangles and hexagons, with UIKit animation.

Understand how closures in Swift are reference types that can cause retain cycles and learn to prevent them with weak or unowned captures, including self.

Explore executing tasks with the functional paradigm in Swift and why it trends across platforms, with a focus on closures and generics.

Explore how filter works in Swift's functional programming, using closure blocks to filter arrays, create generic custom filters, and apply practical examples like filtering grades and even numbers.

Conclude the chapter by exploring functional programming in Swift, focusing on filter and map, and understanding what goes on under the hood of each function, including reactive programming ideas.

Explore protocol extensions and type constraints in Swift, using where clauses and self to restrict generic behavior, and work with associate types for scalable code.

Explore error handling using the result type to create modular, reusable code in Swift, contrast with try-catch, and apply clear success and failure cases for API calls.

Explore Swift key paths and optional chaining to access properties and methods efficiently, store a key path, and choose when to apply them for clearer code.

Master advanced codable techniques by implementing custom encoding and decoding with CodingKeys, containers, and a bespoke encoder or decoder to flexibly map keys and properties.

Explore advanced dictionary concepts in Swift, including optional values, default values, initializing from sequences, grouping by first letters, and functional operations like map, filter, and zip.