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. This is lesson 2 of 3. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the Swift Academy learning path, and your progress syncs across the web and the CoddyKit app. The Swift Academy course includes 3 lessons in total.
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.
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Frequently Asked Questions
Is the “Core types: numbers, Bool, String, Character” lesson free?
Yes — any 3 lessons of the Swift Academy learning path, including “Core types: numbers, Bool, String, Character”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Swift Academy course includes 3 lessons in total.
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, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 3.
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
- let vs var, type inference, literals, tuples
- Core types: numbers, Bool, String, Character
- Optionals intro: ?, nil, if let, guard let, ??