Swift for Beginners

Swift is the language used to build iOS apps for iPhone and iPad. In this section, you'll find simple explanations and examples that make it easy to start coding, even if you've never written a program before.

• First Swift Program
  • Launching Playground
  • Writing Your First Swift Program
• Swift Comments
  • Single-Line Comments in Swift
  • Multi-Line Block Comments in Swift
• Swift Variables
  • Variables and Constants in Swift
  • Naming Rules for Swift Variables
• Swift Basic Data Types
  • How to Specify Data Types in Swift
  • Basic Data Types in Swift
• Swift Strings
  • Swift String Basics and String Interpolation
  • Concatenating and Splitting Strings in Swift
  • Replacing and Finding Strings in Swift
  • Escaping and Trimming Strings in Swift
  • Extracting Substrings in Swift
  • Converting and Formatting Strings in Swift
• Swift Operators
  • Arithmetic Operators in Swift
  • Comparison Operators in Swift
  • Assignment Operators in Swift
  • Logical Operators in Swift
  • Range Operators in Swift
• Swift Naming Conventions
• Swift Arrays
  • Swift Arrays - Modify and Add Elements
  • Swift Arrays - Removing Elements
  • Swift Arrays - Count and Element Positions
  • Swift Arrays - Sorting Elements
  • Swift Arrays - Loops, map, and filter
• Swift Sets
  • Swift Set - Creating and Adding Elements
  • Swift Set - Removing Elements
  • Swift Set - Counting and Checking Elements
  • Swift Set - Loop, map, and filter
  • Set Operations in Swift
  • Swift Set - Subsets, Supersets, and Disjoint Sets
• Swift Dictionaries
  • Swift Dictionary - Creating, Updating, and Adding Key-Value Pairs
  • Swift Dictionary - Removing Key-Value Pairs
  • Swift Dictionary - Count and Key Existence
  • Swift Dictionary - Loops, mapValues, and filter
• Swift Tuples
  • Basics of Swift Tuples
  • Accessing Tuple Elements in Swift
  • Modifying Tuple Elements in Swift
• Swift if Statement
  • Basics of the if Statement in Swift
  • if Statements with Multiple Conditions
  • Ternary Conditional Operator in Swift
• Swift switch Statement
  • Basics of the switch Statement in Swift
  • Using fallthrough in switch Cases
  • Using Ranges in switch Cases
• Swift for Loop
  • Basics of the for-in Loop in Swift
  • Using continue in a for-in Loop
  • Using break in a for-in Loop
  • Using where with for-in Loops
• Swift while Loop
  • The while Statement in Swift
  • The repeat-while Statement in Swift
• Swift Optionals
  • What Are Optionals in Swift?
  • Unwrapping Optionals in Swift
  • Optional Binding with if let
  • Optional Binding with guard let
  • Optional Chaining in Swift
  • Providing Default Values with ??
• Swift Type Checking and Casting (is / as Operators)
  • Checking Types with is in Swift
  • Converting Types with as in Swift
• Swift Functions
  • What Are User-Defined Functions in Swift?
  • Defining Functions in Swift
  • Function Parameters in Swift
  • Default Parameter Values in Swift Functions
  • Variadic Parameters in Swift Functions
  • Return Values in Swift Functions
  • Returning Multiple Values from a Function
  • Passing Parameters by Reference with inout
• Swift Enums
  • What Are Enums in Swift?
  • Defining Enums in Swift
  • Using Enums in switch Statements
  • Passing Enums as Parameters
  • Using Enums with Associated Values
  • Using Enums with Raw Values
• Swift Structs
  • Basics of Swift Structs
  • How to Use Structs in Swift
  • Structs are Value Types in Swift
• Swift Classes
  • Basics of Swift Classes
  • How to Use Classes in Swift
  • Classes are Reference Types in Swift
  • Inheriting Classes and Defining Subclasses
  • Adding Methods to Subclasses
  • Overriding Methods from a Base Class
• Swift defer Statement
  • Basics of the defer Statement in Swift
  • Variables Inside a defer Statement
  • Multiple defer Statements
  • Using defer with do Blocks
• Swift Property Observers (willSet / didSet)
  • Basics of Property Observers in Swift
  • Using willSet and didSet in Swift
• Swift Extensions