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Learn Swift

A free, interactive online Swift course. You write Swift on every lesson, with AI hints when an optional surprises you, and a free certificate when you finish.

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2,055+ codders enrolled

  • Beginner friendly
  • sparkles iconAI-assisted coding help
  • hint iconHands-on interactive lessons
  • volume On iconAudio narration on every lesson
  • quiz iconQuizzes to test your knowledge
  • certificate iconFree certificate of completion

Syllabus

2 sections5 projects142 lessons121 challenges831 quiz questions
  1. Section 1

    Fundamentals

    Start sectionStartExpandCollapse    Build a strong foundation with essential concepts and basic skills86 lessons73 challenges457 questions3 projects

    Introduction

    3 lessons316
    • 01The LanguageChallenge
    • 02Hello World!ChallengeQuiz
    • 03CommentsChallengeQuiz

    Variables

    7 lessons751
    • 01Let vs VarChallengeQuiz
    • 02Type AnnotationsChallengeQuiz
    • 03NumbersChallengeQuiz
    • 04StringChallengeQuiz
    • 05BooleanChallengeQuiz
    • 06Naming ConventionsChallengeQuiz
    • 07Recap - Initialize VariablesChallenge

    Optionals

    5 lessons532
    • 01What Are OptionalsChallengeQuiz
    • 02Unwrapping With If LetChallengeQuiz
    • 03Guard LetChallengeQuiz
    • 04Nil Coalescing OperatorChallengeQuiz
    • 05Recap - Safe UnwrappingChallenge

    Operators Part 1

    5 lessons534
    • 01Arithmetic OperatorsChallengeQuiz
    • 02Modulo OperatorChallengeQuiz
    • 03Compound AssignmentChallengeQuiz
    • 04Recap - Simple MathChallenge
    • 05Comparison OperatorsChallengeQuiz

    Operators Part 2

    5 lessons532
    • 01Logical Operators Part 1ChallengeQuiz
    • 02Logical Operators Part 2ChallengeQuiz
    • 03Recap - Simple LogicChallenge
    • 04Logical Operators Part 3ChallengeQuiz
    • 05Ternary OperatorChallengeQuiz

    Decision Making

    5 lessons534
    • 01If StatementChallengeQuiz
    • 02If - ElseChallengeQuiz
    • 03Recap - Simple CalculatorChallenge
    • 04Switch StatementChallengeQuiz
    • 05Switch With RangesChallengeQuiz

    Basic IO

    6 lessons634
    • 01Print FunctionChallengeQuiz
    • 02String InterpolationChallengeQuiz
    • 03ReadLine InputChallengeQuiz
    • 04Type ConversionChallengeQuiz
    • 05Recap - Till 120Challenge
    • 06Recap - True or FalseChallenge

    Bill Split Calculator

    Project5 lessons1
    • 01Welcome MessageChallenge
    • 02Getting InputProject
    • 03Calculating Tip And TotalProject
    • 04Splitting The BillProject
    • 05Formatted OutputProject

    Loops

    9 lessons967
    • 01For-In LoopChallengeQuiz
    • 02While LoopChallengeQuiz
    • 03Repeat-While LoopChallengeQuiz
    • 04BreakChallengeQuiz
    • 05ContinueChallengeQuiz
    • 06Recap - FactorialChallengeQuiz
    • 07Ranges In LoopsChallengeQuiz
    • 08Nested LoopChallengeQuiz
    • 09Recap - Dynamic InputChallenge

    Functions

    7 lessons742
    • 01Declare A FunctionChallengeQuiz
    • 02Parameters And ArgumentsChallengeQuiz
    • 03Return ValuesChallengeQuiz
    • 04Argument LabelsChallengeQuiz
    • 05Recap - Sigma FunctionChallenge
    • 06Recap - Validation FunctionChallenge
    • 07Default ValuesChallengeQuiz

    FizzBuzz with a Twist

    Project4 lessons1
    • 01Game OverviewChallenge
    • 02The FizzBuzz FunctionProject
    • 03Looping The NumbersProject
    • 04Adding The TwistProject

    Arrays Basics

    7 lessons745
    • 01Declaring An ArrayChallengeQuiz
    • 02Accessing ElementsChallengeQuiz
    • 03Modifying ArraysChallengeQuiz
    • 04Array MethodsChallengeQuiz
    • 05Recap - Product ListChallenge
    • 06Recap - Reversed ArrayChallenge
    • 07TuplesChallengeQuiz

    Iterating Over Sequences

    4 lessons434
    • 01Iterating Over ElementsChallengeQuiz
    • 02The Enumerated MethodChallengeQuiz
    • 03Iterating Over Strings P1ChallengeQuiz
    • 04Iterating Over Strings P2ChallengeQuiz

    Arrays Advanced

    4 lessons436
    • 01Array Slicing Part 1ChallengeQuiz
    • 02Array Slicing Part 2ChallengeQuiz
    • 03Sequence OperatorsChallengeQuiz
    • 04The Contains MethodChallengeQuiz

    Daily Expense Tracker

    Project7 lessons1
    • 01Project OverviewChallenge
    • 02Exit The ProgramProject
    • 03Add ExpenseProject
    • 04View All ExpensesProject
    • 05Total And AverageProject
    • 06Clear AllProject
    • 07Handling ErrorsProject

    Final Challenges

    3 lessons3
    • 01Flat Asterisk PyramidChallenge
    • 02Pattern FinderChallenge
    • 03What To BuyChallenge
  2. Section 2

    Logic & Flow

    Start sectionStartExpandCollapse    Sharpen your Swift with strings, ranges, dictionaries, sets, higher-order functions, closures, and error handling. Two guided projects tie everything together.56 lessons48 challenges374 questions2 projects

    Strings In Depth

    6 lessons643
    • 01Count and IndicesChallengeQuiz
    • 02Case and TrimChallengeQuiz
    • 03Searching in StringsChallengeQuiz
    • 04Splitting and JoiningChallengeQuiz
    • 05Replacing SubstringsChallengeQuiz
    • 06Recap - Username CheckChallenge

    Ranges & Strides

    5 lessons533
    • 01Closed vs Half-OpenChallengeQuiz
    • 02StrideChallengeQuiz
    • 03Range MethodsChallengeQuiz
    • 04Ranges in SwitchChallengeQuiz
    • 05Recap - Calendar GridChallenge

    Dictionaries

    6 lessons641
    • 01Declaring DictionariesChallengeQuiz
    • 02Optional LookupChallengeQuiz
    • 03Updating DictionariesChallengeQuiz
    • 04Iterating DictionariesChallengeQuiz
    • 05Grouping ValuesChallengeQuiz
    • 06Recap - InventoryChallenge

    Sets

    5 lessons535
    • 01Creating SetsChallengeQuiz
    • 02Union and IntersectionChallengeQuiz
    • 03Subtracting and SymmetricChallengeQuiz
    • 04Subset and SupersetChallengeQuiz
    • 05Recap - Tag FilterChallenge

    Higher-Order Functions Pt1

    5 lessons533
    • 01MapChallengeQuiz
    • 02FilterChallengeQuiz
    • 03ReduceChallengeQuiz
    • 04Chaining map, filter, reduceChallengeQuiz
    • 05Recap - Word StatsChallenge

    Higher-Order Functions Pt2

    5 lessons532
    • 01compactMapChallengeQuiz
    • 02flatMapChallengeQuiz
    • 03sorted(by:)ChallengeQuiz
    • 04Building PipelinesChallengeQuiz
    • 05Recap - LeaderboardChallenge

    Project - Habit Tracker

    Project5 lessons142
    • 01Project OverviewChallengeQuiz
    • 02Mark DoneProjectQuiz
    • 03Longest StreakProjectQuiz
    • 04Weekly GridProjectQuiz
    • 05Compare WeeksProjectQuiz

    Closures

    6 lessons641
    • 01Closure BasicsChallengeQuiz
    • 02Trailing ClosuresChallengeQuiz
    • 03Capturing ValuesChallengeQuiz
    • 04Returning ClosuresChallengeQuiz
    • 05Custom Higher-OrderChallengeQuiz
    • 06Recap - Pipeline BuilderChallenge

    Error Handling

    5 lessons533
    • 01throws and ErrorChallengeQuiz
    • 02do, try, catchChallengeQuiz
    • 03try? and try!ChallengeQuiz
    • 04Propagating ErrorsChallengeQuiz
    • 05Recap - Safe CalculatorChallenge

    Project - Quiz Engine

    Project5 lessons141
    • 01Project OverviewChallengeQuiz
    • 02Ask QuestionsProjectQuiz
    • 03Lenient GradingProjectQuiz
    • 04Filter by CategoryProjectQuiz
    • 05Summary ReportProjectQuiz

    Final Challenges

    3 lessons3
    • 01Anagram GroupsChallenge
    • 02Log AggregatorChallenge
    • 03Calculator With HistoryChallenge

Swift courses

Hands-on Swift courses, free to start in your browser.

Data Structures

Beginner Challenges - Practice Basic Concepts

Popular

Put your beginner coding knowledge to test and try to solve this programming challenges, use any language you want, Happy Coding!

certificate icon

Certificate on completion

  • 20
  • 20

Coding Problems

Popular

Put your programming problem solving skills to the test using the exercises with different difficulties in this course. Designed for coders with some prior knowledge of the basic syntax in any programming language.

certificate icon

Certificate on completion

  • 32
  • 31

Stack - Data Structures Series #1

In this course, you will learn about the Stack data structure, create a Stack from zero using your preferred language, and practice coding challenges with it!

Data Structures
  • 13
  • 6
  • 1

Coding Problems: Volume 2

Put your programming problem solving skills to the test using the exercises with different difficulties in this course. Designed for coders with some prior knowledge of the basic syntax in any programming language. This course is an extension of the first Coding Problems

certificate icon

Certificate on completion

  • 25
  • 24

Heaps & Priority Queues - Data Structures Series #7

New

In this course, you will learn about the Heap data structure (the backbone of priority queues), create a MinHeap from zero using your preferred language, and practice coding challenges with it!

Data Structures
certificate icon

Certificate on completion

  • 14
  • 6
  • 1

Binary Tree - Data Structures Series #3

In this course, you will learn about the Binary Tree data structure, create a Binary Tree from zero using your preferred language, and practice coding challenges with it!

Data Structures
  • 13
  • 5
  • 1
See all 27 Swift courses →

Why learn Swift with Coddy

  • Write and run real Swift code in your browser. No Xcode install, no Mac required. Each lesson compiles your Swift program server-side and shows the output instantly, so you can learn Swift on Windows, Linux, or any machine.
  • Modern Swift: variables and types, control flow, optionals, structs vs classes, protocols, generics, closures, error handling. The Swift foundations every iOS developer needs.
  • AI hints help you read and fix Swift compiler errors and unwrap optionals correctly, so concepts like nil-safety and value vs reference types click instead of confusing you.
  • Free Swift certificate when you finish the course. A credible signal for iOS, macOS, watchOS, and visionOS developer roles where Swift is the primary language.

Frequently asked questions about learning Swift

What is Swift programming used for?

Swift is Apple's primary language for building apps on iOS, iPadOS, macOS, watchOS, tvOS, and visionOS. The vast majority of new iPhone and Mac apps are written in Swift, and Apple's frameworks (SwiftUI, UIKit, AppKit) are designed around it. Outside Apple platforms, Swift is also used for server-side code, but app development is the dominant reason people learn Swift.

Is Swift hard to learn?

Swift is one of the more approachable strongly-typed languages. The syntax is concise, type inference removes a lot of boilerplate, and modern features like optionals and pattern matching are well-designed. The trickier parts (memory management with ARC, advanced generics, protocol-oriented programming) come later and are introduced gradually.

Can I learn Swift on Windows or Linux?

Yes. The course compiles Swift server-side, so you can learn the Swift programming language on Windows, Linux, or Chromebook with no Xcode and no Mac required. To actually ship iOS apps to the App Store you'll eventually need a Mac and Xcode, but you can learn the entire Swift language without one.

Should I learn Swift or Objective-C?

Swift, in almost every case. Apple has been steering developers toward Swift since 2014 - most modern iOS tutorials, sample code, and SwiftUI documentation are Swift-only. Objective-C still appears in older codebases, but Swift is the language for new iOS, macOS, and visionOS work.

How long does it take to learn Swift?

Swift basics - variables, control flow, functions, structs - take one to two weeks of daily practice. Becoming comfortable with optionals, classes, protocols, and closures usually takes one to three months. Going deeper into SwiftUI or UIKit to actually ship iOS apps is a separate ramp on top of the language itself.

Do I get a certificate after the Swift course?

Yes. Finishing the Swift course gives you a free certificate of completion you can add to your resume or share on LinkedIn - useful as a stepping stone toward iOS development with SwiftUI.
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