Elizabeth is an API testing tool written in Swift and SwiftUI.

This project was developed as part of a Swift programming course, covering 8 fundamental chapters: The Basics, Basic Operators, Strings and Characters, Collection Types, Control Flow, Functions, Closures, and Enumerations.

macOS 15.7 or later

Xcode 26.2 or later

Checklist tracking Swift concepts from The Swift Programming Language guide. Each topic represents a chapter with practical examples in the app.

The Basics

• Declaring Constants and Variable
  • Type Annotations
  • Naming Constants and Variables
  • Printing Constants and Variables
• Comments
• Semicolons
• Integers
  • Integer Bounds
  • Int
  • UInt
• Floating-Point Numbers
• Type Safety and Type Inference
• Numeric Literals
• Numeric Type Conversion
  • Integer Conversion
  • Floating-Point Conversion
• Type Aliases
• Booleans
• Tuples
• Optionals
  • Nil
  • Optional Binding
  • Providing a Fallback Value
  • Force Unwrapping
  • Implicitly Unwrapped Optionals
• [-] Error Handling
• Assertions and Preconditions
  • Debugging with Assertions
  • Enforcing Preconditions

Basic Operators

• Assignment Operator
• Arithmetic Operators
  • Addition (+)
  • Subtraction (-)
  • Multiplication (*)
  • Division (/)
  • Remainder Operator
  • Unary Minus Operator
  • Unary Plus Operator
• Compound Assignment Operators
• Comparison Operators
• Ternary Conditional Operator
• Nil-Coalescing Operator
• Range Operators
  • Closed Range Operator
  • Half-Open Range Operator
  • One-Sided Ranges
• Logical Operators
  • Logical NOT Operator
  • Logical AND Operator
  • Logical OR Operator
• Combining Logical Operators
• Explicit Parentheses

Strings and Characters

• String Literals
  • Multiline String Literals
  • Special Characters in String Literals
  • Extended String Delimiters
• Initializing an Empty String
• String Mutability
• [-] Strings Are Value Types
• Working with Characters
• Concatenating Strings and Characters
• String Interpolation
• Unicode
  • Unicode Scalar Values
  • Extended Grapheme Clusters
• Counting Characters
• Accessing and Modifying a String
  • String Indices
  • Inserting
  • Removing
• Substrings
• Comparing Strings
  • String and Character Equality
  • Prefix and Suffix Equality
• Unicode Representations of Strings
  • UTF-8 Representation
  • UTF-16 Representation
  • Unicode Scalar Representation

Collection Types

• Array
  • Array Type Shorthand Syntax
  • Creating an Empty Array
  • Creating an Array with a Default Value
  • Creating an Array by Adding Two Arrays Together
  • Creating an Array with an Array Literal
  • Accessing and Modifying an Array
  • Iterating Over an Array
• Set
  • Creating and Initializing an Empty Set
  • Creating a Set with an Array Literal
  • Accessing and Modifying a Set
  • Iterating Over a Set
• Performing Set Operations
  • Fundamental Set Operations
  • Set Membership and Equality
• Dictionary
  • Dictionary Type Shorthand Syntax
  • Creating an Empty Dictionary
  • Creating a Dictionary with a Dictionary Literal
  • Accessing and Modifying a Dictionary
    • isEmpty
    • Add New
  • Iterating Over a Dictionary
    • Iterable collection of a dictionary’s keys or values

Control Flow

• For-In Loops
• While Loops
  • While
  • Repeat-While Loops
• Conditional Statements
  • If
    • If Expression
  • Switch
    • Switch Expression
    • Interval Matching
    • [-] Tuples
    • [-] Value Bindings
• Patterns
  • If
  • For-In
• Control Transfer Statements
  • Continue
  • Break
  • Fallthrough
  • Labeled Statements
• Early Exit
• Deferred Actions
• Checking API Availability

Functions

• Defining and Calling Functions
• Function Parameters and Return Values
  • Functions Without Parameters
  • Functions With Multiple Parameters
  • Functions Without Return Values
  • Functions With Multiple Return Values
  • Functions With an Implicit Return
• Function Argument Labels and Parameter Names
  • Specifying Argument Labels
  • Omitting Argument Labels
  • Default Parameter Values
  • Variadic Parameters
  • In-Out Parameters
• Function Types
  • Using Function Types
  • Function Types as Parameter Types
  • Function Types as Return Types
• Nested Functions

Closures

• Closure Expressions
  • The Sorted Method
  • Closure Expression Syntax
  • Inferring Type From Context
  • Implicit Returns from Single-Expression Closures
  • Shorthand Argument Names
  • Operator Methods
• Trailing Closures
• Capturing Values
• Closures Are Reference Types
• Escaping Closures
• Autoclosures

Enumerations

• Enumeration Syntax
• Matching Enumeration Values with a Switch Statement
• Iterating over Enumeration Cases
• Associated Values
• Raw Values
  • Implicitly Assigned Raw Values
  • Initializing from a Raw Value
• Recursive Enumerations

• https://docs.swift.org/swift-book/documentation/the-swift-programming-language/
• https://developer.apple.com/documentation/SwiftUI/Migrating-from-the-observable-object-protocol-to-the-observable-macro
• https://developer.apple.com/documentation/swiftui/environment
• https://developer.apple.com/documentation/SwiftUI/Applying-Liquid-Glass-to-custom-views
• https://developer.apple.com/documentation/swiftui/progressview