0Pricing
Swift Academy · Lesson

Core types: numbers, Bool, String, Character

Explore Swift's core types: numbers, booleans, strings, and characters.

Core types: numbers, Bool, String, Character is a free Swift Academy lesson on CoddyKit — lesson 2 of 3. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Swift Academy learning path, one of 3 lessons in the course, and your progress syncs across the web and the CoddyKit app.

Intro

Swift core types cover numbers, booleans, strings, and characters. They are safe, efficient, and widely used.

Numbers

Swift offers numeric types: Int, Double, Float. Choose based on precision.

let intVal: Int = 42
let doubleVal: Double = 3.14
let floatVal: Float = 2.5
print("Int =", intVal, "Double =", doubleVal, "Float =", floatVal)

Booleans

The Bool type holds true or false values for conditions.

let isSwiftFun: Bool = true
if isSwiftFun {
    print("Swift is fun!")
} else {
    print("Not fun?")
}

Strings

Strings store text. You can concatenate them or use interpolation.

let greeting: String = "Hello"
let name = "Swift"
print(greeting + ", " + name)

Characters

Character stores a single Unicode symbol, like A or an emoji.

let letter: Character = "A"
let symbol: Character = "⭐"
print("Letter:", letter, "Symbol:", symbol)

Type conversions

You can convert between types. Example: String(42) creates "42". Explicit conversion avoids mistakes.

Character type

Quick check: Which Swift type is best for a single Unicode symbol?

Recap

Recap: Core types include Int, Double, Float for numbers, Bool for logic, String for text, and Character for single symbols.

Frequently asked questions

Is the “Core types: numbers, Bool, String, Character” lesson free?

Yes — the full text of “Core types: numbers, Bool, String, Character” is free to read here on the web, and the Swift Academy course includes 3 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Swift Academy course, upgrade to CoddyKit PRO.

What will I learn in “Core types: numbers, Bool, String, Character”?

Explore Swift's core types: numbers, booleans, strings, and characters. You practise Swift Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Swift Academy?

No prior experience is required. Swift Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 3, so you can start here or from the beginning and move at your own pace.

How long does the “Core types: numbers, Bool, String, Character” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Swift Academy lesson?

Yes. Every Swift Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. let vs var, type inference, literals, tuples
  2. Core types: numbers, Bool, String, Character
  3. Optionals intro: ?, nil, if let, guard let, ??
← Back to Swift Academy