The Comprehensive Guide to Swift

Explore how the assignment operator in Swift executes the right-hand side before assigning its value to the left-hand side, clarifying value setting for variables and constants.

Learn swift arithmetic: perform division with integers and doubles. Cast to double for accurate decimals and use the modulo operator to find leftovers, illustrated with pizza slices and 50 people.

Learn how arrays represent a line of variables in Swift, using var for mutable arrays, with type inference and explicit typing to store strings like Fred and Barney.

Explore how to remove and access array elements using dot syntax and subscript notation, update values, and understand zero-based indexing with a practical Swift example.

Learn how to use dictionaries in Swift to map string keys like name, location, occupation, and best friend to string values, build a person dictionary, and access values by key.

Explore updating a dictionary in Swift by using update value for key and by subscript assignment, then verify the location key shows the new value, such as on a boat.

Explore the not operator to invert a boolean value in Swift by placing an exclamation mark before a variable; it reads as the opposite without reassigning the value.

Learn to automate tasks with while loops, using the dry principle to avoid repetition. Track iterations with an iterator while printing results in the console.

Learn how the do while loop guarantees the block runs at least once before checking the condition, and how it keeps code DRY by avoiding repetition.

Learn how to adapt for loops to dynamic arrays by using array.count instead of hard-coded numbers, ensuring count updates with each added item, and avoiding brittle code.

Learn to write a Swift function that uses raw values to compute the number of planets between two enum cases, subtracting one, with a Mercury to Jupiter example.

Learn how to assign default values to struct properties, including a boolean default like true, using the assignment operator, and why a custom initializer may be needed to override defaults.

Use struct methods to operate on data in the struct and return a name string like 'my name is {monster name}', then initialize a monster and call its method.

Compare Swift structs and classes by building a simple item model with name and price, exploring properties, dot syntax, and the need for initializers and designated initializers.

Explore class methods in Swift by adding a half-off method that returns a discounted price as a double, and learn how to access and modify class properties.

Explore inheritance in Swift by defining an instrument subclass of the Item base class, and observe how properties and initializers flow from superclass to subclass, including the rock band flag.

Learn to override methods in Swift by using a base class, subclass, and superclass; implement an extra discount with a default 20 percent using super to avoid duplication.

Discover how convenience initializers simplify object creation in Swift by delegating to designated initializers within a class. Learn rules about super and self, with a rock instrument example.

Explore how computed properties in Swift use a getter and a setter to manage derived values, such as adjusting the boys count when total students changes, using the newValue parameter.