Project structure and Swift Package Manager basics - Mini Project: Build & Apply

Project structure and Swift Package Manager basics

📖 Scenario: You are starting a new Swift project to manage a small library of books. You want to organize your code properly and use Swift Package Manager (SPM) to handle your project dependencies and build.

🎯 Goal: Build a simple Swift package with a basic project structure, add a configuration variable, write core logic to list book titles, and print the result.

📋 What You'll Learn

Create a Swift package with a Package.swift manifest file

Define a library target with source files

Add a configuration variable for minimum pages

Write core logic to filter books by page count

Print the filtered book titles

💡 Why This Matters

🌍 Real World

Organizing code and managing dependencies with Swift Package Manager is essential for building scalable and maintainable Swift applications.

💼 Career

Understanding project structure and package management is a key skill for Swift developers working on iOS, macOS, or server-side Swift projects.

1

Create the initial data structure

Create a Swift dictionary called books with these exact entries: "Swift Programming": 350, "iOS Development": 420, "Algorithms": 280, "Data Structures": 300 representing book titles and their page counts.

Swift

# Create the dictionary called books with titles and page counts
# Your code here

Need a hint?

Use a Swift dictionary with String keys and Int values.

2

Add a configuration variable

Add a constant called minPages and set it to 300 to use as a filter threshold for books.

Swift

let books = [
    "Swift Programming": 350,
    "iOS Development": 420,
    "Algorithms": 280,
    "Data Structures": 300
]

// Add the minPages constant below
// Your code here

Need a hint?

Use let minPages = 300 to create the constant.

3

Filter books by page count

Create a constant called filteredBooks that uses a dictionary comprehension to include only books with page counts greater than or equal to minPages.

Swift

let books = [
    "Swift Programming": 350,
    "iOS Development": 420,
    "Algorithms": 280,
    "Data Structures": 300
]

let minPages = 300

// Create filteredBooks dictionary with books having pages >= minPages
// Your code here

Need a hint?

Use the filter method on the dictionary with a closure checking $0.value >= minPages.

4

Print the filtered book titles

Print the keys of filteredBooks as an array using print(Array(filteredBooks.keys)).

Swift

let books = [
    "Swift Programming": 350,
    "iOS Development": 420,
    "Algorithms": 280,
    "Data Structures": 300
]

let minPages = 300

let filteredBooks = books.filter { $0.value >= minPages }

// Print the titles of filteredBooks
// Your code here

Need a hint?

Use print(Array(filteredBooks.keys)) to show the filtered book titles.