NEW: Subscribe to Hacking with Swift+ and accelerate your learning! >>

< Back to Hacking with Swift+

Queues and deques

In the full episode…

  • What are queues and deques?
  • Quick implementations
  • Constrained extensions
  • Priority queues
  • Further reading
  • Challenges
Get the full 28:18 video by subscribing

Why subscribe?


Hacking with Swift+ delivers high-quality tutorials for subscribers, with each tutorial coming as a 4K Ultra HD video and in text form so you can read or watch – whatever works best for you.

So, you can get this full video and article as well as all other subscriber-only tutorials and all future tutorials – all by subscribing to Hacking with Swift+ today.

Subscribe to Hacking with Swift+

More from Hacking with Swift+


How to use phantom types in Swift
ADVANCED SWIFT

FREE: How to use phantom types in Swift

Phantom types are a powerful way to give the Swift compiler extra information about our code so that it can stop us from making mistakes. In this article I’m going to explain how they work and why you’d want them, as well as providing lots of hands-on examples you can try.

Using memoization to speed up slow functions
HIGH-PERFORMANCE APPS

FREE: Using memoization to speed up slow functions

In this article you’ll learn how memoization can dramatically boost the performance of slow functions, and how easy Swift makes it thanks to its generics and closures.

Creating a WaveView to draw smooth waveforms
CUSTOM SWIFTUI COMPONENTS

FREE: Creating a WaveView to draw smooth waveforms

In this article I’m going to walk you through building a WaveView with SwiftUI, allowing us to create beautiful waveform-like effects to bring your user interface to life.

Creating a StretchingHeader that sticks to the top of a view
CUSTOM SWIFTUI COMPONENTS

Creating a StretchingHeader that sticks to the top of a view

When users scroll beyond the top of a scroll view the default behavior is to show some empty space, but many apps prefer to show a stretchy header area instead. In this article I’ll show you how to build that SwiftUI, making an image that stays fixed to the top no matter what.

Basic button customization using ButtonStyle
INTERMEDIATE SWIFTUI

Basic button customization using ButtonStyle

SwiftUI’s humble Button view is actually capable of doing remarkable things if you take the time to customize it. In this video I’ll be walking you through the ButtonStyle protocol, showing you how we can use it to make great-looking and reusable button effects.

Creating a FilteringList to filter a list using text input
CUSTOM SWIFTUI COMPONENTS

Creating a FilteringList to filter a list using text input

Many apps show lots of data in a list, and allow users to filter that list by typing in a text view. In this article we’re going to build that in SwiftUI, then pull it out into a reusable component you can apply anywhere.

Remaking the iOS lock screen
REMAKING APPS

Remaking the iOS lock screen

In this article we’re going to look at how easy it is to rebuild the iOS lock screen. Yes, this isn’t hard, but along the way I think you’ll pick up a few cool SwiftUI tricks, including better date formatting, haptic buttons, and more.

Remaking the Tips app
REMAKING APPS

Remaking the Tips app

In this article we’re going to look at how to rebuild the Tips app using SwiftUI, including how to make scrolling tabs of content, how to get a parallax scrolling effect, and more.

User-friendly network access
NETWORKING

User-friendly network access

Anyone can write Swift code to fetch network data, but much harder is knowing how to write code to do it respectfully. In this article we’ll look at building a considerate network stack, taking into account the user’s connection, preferences, and more.

Creating a particle system in SwiftUI
SWIFTUI SPECIAL EFFECTS

Creating a particle system in SwiftUI

Particle systems let us create special effects such as confetti, fire, smoke, rain, and snow, all by adjusting a range of inputs. In this article we’re going to build our own particle system entirely driven by SwiftUI, so you can easily add some sparkle to your apps.

Identifying performance hot spots with Time Profiler
HIGH-PERFORMANCE APPS

Identifying performance hot spots with Time Profiler

Instruments gives us a range of tools for finding performance problems, and in this article we’ll be looking at how the Time Profiler instrument can point out problems in seconds.

Using dates safely and effectively
MAKING THE MOST OF FOUNDATION

Using dates safely and effectively

Working with dates in software is hard, and if you don’t understand why then think about time zones, think about leap years, or think about how it’s the year 2563 in the Thai calendar. Apple gives us many tools for making them easier but they can be hard to discover, so in this article I’m going to try to provide some clear guidance for what to use and when.

Customizing Toggle using ToggleStyle
INTERMEDIATE SWIFTUI

Customizing Toggle using ToggleStyle

Most of the time the built-in iOS controls are great, but sometimes you want something just a little different. In this article I’m going to walk you through how you can take complete control over the way toggle switches work in SwiftUI, providing custom rendering and interactions.

Linked lists
DATA STRUCTURES

Linked lists

If there’s one data structure they just love teaching you at school, it’s linked lists. In this article we’re going to look at why linked lists are so appealing, walk through how to build a linked list with Swift, and look at an alternative approach using enums.

Creating a LongPressButton to trigger after delay
CUSTOM SWIFTUI COMPONENTS

Creating a LongPressButton to trigger after delay

In this article I’m going to walk you through building a LongPressButton with SwiftUI, which will requires users to press and hold for a second before it’s triggered.

Making the most of optionals – part 2
ADVANCED SWIFT

Making the most of optionals – part 2

I already introduced how the internals of optionals work, including how they use conditional conformance and how to avoid infinitely sized structs. In this video I’m going to go further as we look at how our knowledge of Optional can be translated to Result, why it’s so important that optionals are functors and monads, and more.

Creating a FlipView to provide a card flip effect
CUSTOM SWIFTUI COMPONENTS

Creating a FlipView to provide a card flip effect

If you’re looking for a simple and fun special effect to add to your code, I’ve got just the thing for you. In this article I’m going to walk you through building a FlipView with SwiftUI, which will encapsulate how to move between a front view and a back view using a 3D flip animation.

Finding and fixing slow rendering
HIGH-PERFORMANCE APPS

Finding and fixing slow rendering

Instruments is a powerful tool for identifying performance problems, but in this article I’ll show you how to find code that slows down rendering in your app, causing slow scrolling, wasted CPU time, and more – all through the simulator.

Creating a ShapeView to render UIBezierPaths
CUSTOM SWIFTUI COMPONENTS

Creating a ShapeView to render UIBezierPaths

Bezier paths let us draw all sorts of shapes efficiently and smoothly, and with a little work we can bring them into SwiftUI then animate them smooth, and in this article I’m going to walk you through making a very simple ShapeView struct to do just that.

Controlling views using the accelerometer
SWIFTUI SPECIAL EFFECTS

Controlling views using the accelerometer

Reading device motion and orientation is a fast and slightly magical way to incorporate the real world into your apps, and can do a huge amount to add a little spark of delight to your UI. In this article I’m going to show you how easy it is to control SwiftUI layouts using the accelerometer, and give you a few ideas for special effects.

Link copied to your pasteboard.