Video Tutorials

MVVM Is More Than a Pattern

A few months ago, I had an interesting conversation with a reader about the Model-View-ViewModel pattern. Let's call him John. The questions John asked me show that developers new to MVVM often miss or overlook the more profound benefits the pattern brings to the table. In this episode, I'd like to share with you the most important insights of my conversation with John.

in Model-View-ViewModel

Guard Patterns, Tips, and Tricks

Working With Guard in Swift

In the previous episode, we explored what the guard statement is, how it differs from the if statement, and when it's appropriate to use it. This episode takes it one step further. I show you several patterns I use on a daily basis that take advantage of the guard statement.

in Patterns

Exit Early With Guard

Working With Guard in Swift

One of the key differences between junior and more senior developers is how they use the tools they are given. While a junior developer looks for any tool that gets the job done, a more senior developer looks for the tools that can get the job done and selects the most appropriate tool.

in Patterns

Variables, Constants, and Types

Swift Fundamentals

In the previous episode of Swift Fundamentals, we briefly talked about variables and constants. You learned that the var keyword declares a variable and the let keyword declares a constant. Variables and constants both store values that can be referenced by a name.

in Swift

Playgrounds

Swift Fundamentals

Swift is an easy language to get started with. The syntax is easy to understand and reminiscent of other popular programming languages you may already be familiar with. In Swift Fundamentals, you learn the fundamentals of the Swift programming language.

in Swift

Where to Start

Debugging Applications With Xcode

Everyone makes mistakes and developers are no different. As a developer, you spend a significant portion of your time debugging the code you write. It's an inextricable aspect of software development. Some bugs are easy to find while others can make you scratch your head.

in Xcode

Nuts and Bolts of Dependency Injection in Swift

My favorite quote about dependency injection is a quote by James Shore. It summarizes much of the confusion that surrounds dependency injection.

in Patterns

Are Singletons Bad

When I first started dabbling with Cocoa development, I almost immediately came into contact with the singleton pattern. Many Cocoa frameworks, including UIKit and Foundation, use the singleton pattern.

in Patterns

What Is a Singleton and How To Create One In Swift

The singleton pattern is a widely used design pattern in software development. Despite its popularity, it's often considered an anti-pattern. Why is that? In this tutorial, I explain what the singleton pattern entails and how to create singletons in Swift.

in Patterns

Writing More Unit Tests

Unit Testing Core Data Models

It's time to shift gears and focus on the Category class. This shouldn't be difficult since you already know how to write unit tests for a Core Data model and we laid the foundation when we implemented the unit tests for the Note class. Pause the episode for a moment and give it a try.

in Core Data

Writing Better Unit Tests

Unit Testing Core Data Models

Let's start with the updatedAtAsDate computed property. Change the name of the unit test to testUpdatedAtAsDate_NotNil(). We need to implement a second unit test for the updatedAtAsDate computed property if the updatedAt property doesn't have a value.

in Core Data

Unit Testing a Core Data Model

Unit Testing Core Data Models

It's time to write the first unit test for the Note class. The first unit test we write tests the updatedAtAsDate computed property of the Note class. Remember that we only unit test the behavior we add to the Note class. We name the unit test testUpdatedAtAsDate()

in Core Data