The Fast Track to Networking in Swift: Closures, Memory Leak

Name: The Fast Track to Networking in Swift: Closures, Memory Leak
Rating: 5.0 (2 reviews)

Unlock Swift Networking Mastery: Build Fast, Debug Smarter, Code for Big Tech

Created byNorbert Grover

Last updated 1/2025

English

What you'll learn

Understand the core components of a networking service and how they enable modern apps to communicate with remote servers.
Build and configure robust URLs and use the URLSession API to send and receive data efficiently.
Parse JSON responses seamlessly using the Codable protocol and integrate them into your app's architecture.
Implement CRUD operations (Create, Read, Update, Delete) to manage app resources effectively.
Master closures in networking tasks and understand their impact on asynchronous programming in Swift.
Identify and debug memory issues, including handling strong, weak, and unowned references to prevent leaks and retain cycles.
Create custom errors for enhanced error handling and build custom object models for better data management.
Ensure thread safety and manage shared state in networking services to maintain consistency and reliability across your app.

Course content

3 sections • 20 lectures • 3h 25m total length

Introduction to API's and Documentation6:49
In this video, we’re taking a closer look at the Acromine REST API – not to teach you how to integrate it into your projects, but to use it as an example of what basic web service documentation looks like. ?
This tutorial is designed to give you context and foundational knowledge for understanding networking services. We'll demonstrate:
How web services provide endpoints and parameters, like the sf (short form) and lf (long form) in this API.
How to interpret JSON responses with fields such as freq, since, and variants.
The structure of REST API documentation and how developers can use it as a reference when building applications.
By the end of this video, you'll have a clear picture of how web service documentation works, setting the stage for our deeper dive into networking services and how to design and consume APIs in your projects. ?
This is the perfect starting point if you're learning about web services and want to understand the context behind how they operate.
What is a Networking Service?9:33
Welcome to this Udemy tutorial where we explore the fundamentals of networking services using the Acromine REST API as our practical example! ? This video is designed to give you a clear understanding of how networking services work and how they enable applications to fetch and interact with remote data.
In this session, you’ll learn:
The basics of what a networking service is and why it’s essential in modern app development.
How to work with REST APIs, including understanding endpoints, query parameters, and JSON responses.
How to use the Acromine API to retrieve acronym expansions (sf) and discover abbreviations for full forms (lf).
Step-by-step guidance on making API calls, handling responses, and parsing JSON using Swift.
This video provides a practical, hands-on approach to learning networking services, giving you the foundational knowledge needed to build or integrate APIs into your own projects. Whether you’re just starting out or need a refresher, this tutorial is the perfect place to begin your journey into networking in app development.
Introduction to the Course2:14
Welcome to The Fast Track to Networking in Swift: Closures, Memory Leak! In this introductory video, we’ll give you an overview of what this course is all about and what you can expect to learn. If you’ve ever struggled to understand networking services or felt overwhelmed by debugging memory leaks and handling complex data, this course is here to help.
Deciphering a JSON Response: What Does the Data Actually Tell Us?9:46
In this video, we break down a JSON response step by step to help you understand its structure and how to work with it in real-world applications. Using an example JSON response from the Acromine REST API, we’ll explore how acronym expansions and their metadata are organized in this structured data format.
Here’s what you’ll learn in this session:
What the key JSON characters ([, ], {, :, ,) mean and how they define arrays, objects, and key-value pairs.
How to interpret a JSON response, including fields like freq (frequency), lf (long form), and since (earliest recorded year).
The difference between arrays and objects, and how they nest within one another to represent complex data.
How to navigate fields like "lfs" and "vars" to uncover meanings, variants, and associated metadata for a given acronym.
By the end of this video, you’ll have a clear understanding of how JSON data is structured, how to read it, and how to use it effectively in applications. Whether you’re a beginner learning about APIs or a developer looking to improve your JSON skills, this tutorial is the perfect guide
Creating, Updating and Deleting Resources in an API Call9:41
In this video, we explore the essential concepts of creating, updating, and deleting resources in API calls—key operations in managing data with RESTful APIs. Whether you're building applications or integrating with third-party services, mastering these CRUD operations (Create, Read, Update, Delete) is a must for developers.
Here’s what you’ll learn in this session:
How to use HTTP methods like POST, PUT, PATCH, and DELETE to interact with server resources.
The difference between creating a new resource and updating existing ones, with practical examples of PUT versus PATCH.
How to delete resources from the server and understand the typical responses you’ll receive.
Best practices for handling API responses, including status codes like 201 Created, 200 OK, and 204 No Content.
Tips for implementing these operations in code using tools like URLSession in Swift.
By the end of this video, you’ll have a clear understanding of how to create, modify, and delete data in APIs, empowering you to build robust and dynamic applications.
Perfect for beginners or developers brushing up on API fundamentals!
Error Handling in a Networking Service21:45
Learn how to handle errors effectively in your API calls while using escaping closures in Swift. This video covers everything you need to know about managing network failures, server errors, and data parsing issues. We'll explore practical techniques for implementing robust error handling, retry mechanisms, and logging strategies to make your networking service bulletproof. Whether you're a beginner or an experienced developer, you'll gain valuable insights into creating reliable and user-friendly applications. By the end of this tutorial, you'll have a solid understanding of how to gracefully handle errors in your Swift networking code. Perfect for iOS developers looking to enhance their API integration skills!
URL Construction in the Context of a Networking Service16:06
Master the art of building robust and flexible URLs for your networking service using URLComponents in Swift, all while adhering to SOLID principles. In this tutorial, we’ll break down how to dynamically construct URLs with query parameters, endpoints, and base URLs for scalable API integrations. Learn how to implement the Single Responsibility and Open/Closed principles to make your code reusable and maintainable. Whether you’re creating a simple API request or a complex networking service, this video will show you how to design it the right way with clean, modular, and testable code. Perfect for iOS developers aiming to elevate their Swift networking skills!
The Request in a Networking Service15:35
Learn how to create a powerful and flexible request for your networking service in Swift! In this tutorial, we’ll break down the essential components of a network request, including dynamic URL construction, HTTP methods, query parameters, headers, and request bodies. You'll discover how to handle various scenarios like GET, POST, PUT, and DELETE requests within a single reusable function. Plus, we’ll ensure the code adheres to best practices for scalability, maintainability, and clean architecture. Whether you’re building your first API integration or refining your networking skills, this video will guide you step-by-step to design robust requests for your iOS apps.
Handling the Response from a Remote API Call After a GET Request8:39
Learn how to effectively handle responses from remote API calls after making a GET request in Swift! This tutorial walks you through every step, from validating HTTP responses and checking for errors to decoding JSON data into usable formats. Using a real-world example, we’ll show you how to process nested JSON structures dynamically and extract meaningful information. You’ll also discover how to handle edge cases like empty data, invalid formats, and network errors gracefully. Perfect for developers looking to build robust and reliable networking services for their iOS applications!

Custom Object Models and Parsing API Responses19:44
In this video, we’ll walk you through the process of creating custom object models to handle data returned from an API. Using the URL, with the query parameter sf=wan, we'll explore how to decode the response into type-safe Swift objects with the Codable protocol. You’ll learn how to structure your object models to mirror the API’s JSON format, handle nested data efficiently, and see practical examples of how these models can simplify working with the response data in your app. Whether you’re working with complex or straightforward APIs, this tutorial will show you how custom models can make your code cleaner, more readable, and easier to maintain!
Why Use Structs Over Classes for Custom Object Models When Decoding API Data12:50
In this video, we dive deep into the key differences between structs and classes in Swift and how to effectively use them in your object model. You'll learn about the foundational principles of value semantics and reference semantics, and how they influence data flow, memory management, and performance.
Structs Have Automatic Conformance to Protocols2:44
In this quick and insightful video, we explore how struct conformance to protocols can make structs the ideal choice for building flexible and maintainable object models in Swift. Using a short, practical example, we demonstrate:
How structs can conform to multiple protocols to achieve clean, modular code.
The advantages of value semantics when combining structs with protocol-oriented programming.
Why structs are a great alternative to classes in object models, especially in scenarios requiring immutability, performance, and thread safety.
By the end of this video, you’ll see how leveraging structs with protocols can lead to a more elegant and robust object model, aligning perfectly with Swift’s protocol-oriented programming paradigm. Perfect for developers looking to elevate their Swift design skills!
Thread Safety for Structs vs Classes8:49
In this video, we dive into the world of thread safety and race conditions while exploring how structs and classes behave in the context of object models used for parsing data. You’ll learn how these core Swift concepts impact the reliability and safety of your code when working with complex data models in concurrent environments.
We’ll cover:
How value semantics in structs ensure thread safety during data parsing.
Why reference semantics in classes can lead to race conditions when sharing data across threads.
Practical examples comparing structs and classes for parsing and managing object models.
Techniques to design robust data models that avoid concurrency pitfalls.
Tips for improving performance and maintaining clean, thread-safe code.
By the end of this video, you’ll understand the trade-offs between structs and classes in parsing object models and how to choose the right tool to write safer, more efficient Swift code. Perfect for developers dealing with JSON parsing, API data, and multi-threaded environments!
Why You Might Need Shared State in an Object Model (Class)11:07
In this video, we explore the key differences between structs and classes in Swift, focusing on their semantics—value semantics for structs and reference semantics for classes. You'll learn when to use structs for immutable, independent data and when classes are ideal for managing shared state in complex systems.
Through real-world examples like JSON parsing and app state management, we’ll highlight the strengths, limitations, and best use cases for each. By the end, you’ll know how to choose the right tool to write efficient and reliable Swift code. Perfect for developers looking to deepen their understanding of Swift design!
Key Concepts for Thread-Safe Modification: Example 1, A Shared Counter Class8:40
In this video, we explore how to use NSLock to ensure thread-safe modifications to shared objects in Swift. Multithreading can lead to race conditions when multiple threads try to read and write to the same object simultaneously. NSLock provides a simple and effective way to synchronize access to shared resources.
Key Concepts for Thread-Safe Modification: Example 2, A Serial Dispatch Queue4:24
In this video, we explore the concept of thread-safe modification using a serial dispatch queue in Swift. Managing shared state in a multithreaded environment can be tricky, but a serial queue offers an elegant and efficient solution to ensure data integrity.
You’ll learn:
What a serial dispatch queue is and how it works.
Why it’s essential for thread-safe modifications in concurrent programming.
A step-by-step example of using a serial queue to synchronize access to shared resources, ensuring tasks execute one at a time.
Best practices for avoiding common pitfalls, like deadlocks, while improving the reliability of your code.
By the end of this video, you’ll understand how to use serial dispatch queues to safely manage shared state in Swift and enhance your multithreading skills. Perfect for developers looking to write robust and efficient concurrent code!

What is a Memory Leak?9:58
In this video, we explore the concept of memory leaks in Swift by examining a simple example of a retain cycle. Retain cycles occur when two objects hold strong references to each other, preventing them from being deallocated and causing memory to remain occupied unnecessarily.
You’ll learn:
What a memory leak is and how retain cycles lead to leaks.
A step-by-step demonstration of a retain cycle in a simple object relationship.
How to use weak references to break the retain cycle and ensure proper memory management.
Best practices for preventing retain cycles in closures, object hierarchies, and more.
By the end of this video, you’ll have a clear understanding of retain cycles, memory leaks, and how to write safer, more efficient Swift code. Perfect for developers of all levels looking to improve their memory management skills!
Example of a Memory Leak with an Unowned Reference12:55
In this video, we explore the parent-child relationship between objects in Swift and how it can lead to memory leakswhen strong references create a retain cycle. You’ll learn how to identify situations where a child object strongly retains its parent, preventing deallocation, and how to fix this issue by using unowned references.
Example of a Retain Cycle in a Networking Service13:39
Learn how retain cycles occur in Swift networking services when self is strongly captured in closures, causing memory leaks. This video demonstrates how to identify retain cycles using the deinit method, resolve them with [weak self] in the capture list, and safely use implicit unwrapping (self!) to avoid crashes. Master best practices for writing memory-safe networking code in Swift. Perfect for anyone looking to optimize their app’s performance!
Conclusion0:48

Requirements

You should have a firm grasp of closure syntax.
You should be knowledgeable about Swift's syntax.
Be familiar with the contents of one of my previous courses, the 'iOS Job Interview Toolkit'
Be familiar with the contents of one of my previous courses, 'Real World Closures'

Description

Step into the world of Swift networking and gain the skills to thrive at big tech companies. The Fast Track to Networking in Swift: Closures, Memory Leak is the ultimate guide to mastering networking services, debugging, and writing clean, scalable code.

This course covers everything you need to build robust networking solutions, including:

What is a networking service? Understand its components and how it powers modern apps.
Building rock-solid URLs and effectively using URLSession for requests
Parsing JSON responses and leveraging the Codable protocol to simplify data handling
Using closures in networking tasks and understanding their impact on performance
Classes vs. structs: Master reference and value semantics to avoid hidden pitfalls
Debugging strong, weak, and unowned references to fix memory leaks and retain cycles
Understanding and implementing CRUD operations to create, update, and delete resources in your apps
Creating custom errors for better error handling and debugging
Building custom object models to seamlessly integrate networking responses into your app's architecture
Managing shared state in networking services to ensure consistency across your application
Thread safety techniques to avoid race conditions and maintain reliable, crash-free networking services

We’ll also explore practical strategies for solving tricky bugs, optimizing performance, and writing efficient code that meets the high standards of big tech environments.

With real-world examples, actionable insights, and expert guidance, this course goes beyond teaching theory—it equips you to confidently build, debug, and optimize Swift networking services for large-scale applications.

Don’t settle for "just working" code—create networking solutions that are reliable, efficient, and professional. Enroll today and take a major step toward becoming an indispensable developer at any big tech company!

Who this course is for:

Aspiring iOS Developers – If you’re new to iOS development and want to understand one of the most critical aspects of building modern apps, this course will give you the solid foundation you need.
Junior Developers Looking to Level Up – If you already know some Swift basics but feel uncertain about networking, closures, or debugging memory leaks, this course will fill those gaps and boost your confidence.
Intermediate Developers – If you’ve built apps before but want a deeper understanding of networking services, JSON parsing, Codable protocol, and advanced debugging techniques, this course will sharpen your skills and take your code to the next level.
Developers Transitioning to iOS – If you’re coming from a different programming background or platform, this course will help you quickly grasp the intricacies of Swift networking and become proficient in creating efficient and reliable services.
Developers Preparing for Big Tech Interviews – Networking is a key area often tested in technical interviews. This course will equip you with the knowledge and hands-on skills to confidently tackle networking-related questions and challenges.
Freelancers and Independent App Developers – If you’re building apps on your own, this course will give you the tools to create scalable, maintainable networking solutions for professional-grade applications.
Anyone Interested in Building Better Apps – If you want to enhance your ability to build apps that communicate seamlessly with servers, handle data efficiently, and perform reliably under real-world conditions, this course is for you.

The Fast Track to Networking in Swift: Closures, Memory Leak

What you'll learn

Explore related topics

Course content

Dissecting the Components of a Networking Service9 lectures • 1hr 40min

Custom Object Models in the Context of Networking Services7 lectures • 1hr 8min

Debugging Memory Leaks and Retain Cycles4 lectures • 37min

Requirements

Description

Who this course is for: