Range Operators
Range Operators
Range Operators is a free Swift Academy lesson on CoddyKit. This is lesson 1 of 1. 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 1 lessons in total.
Introduction - Closed Range Operator
Hello,
In this lesson, we will learn about the range operators provided to us by Swift.
The first thing we will learn is the Closed Range Operator. This operator creates a closed range, including numbers defined by it.
Let's take a look at our example.
for index in 1...5 {
print("\(index) times 5 is \(index * 5)")
}
// 1 times 5 is 5
// 2 times 5 is 10
// 3 times 5 is 15
// 4 times 5 is 20
// 5 times 5 is 25The Half-Open Range
The Half-Open Range operator creates a half-open range, as we can understand from its name.
When we look at the example below carefully, although the length of the array is 4, the range is between 0 and 3.
let cats = ["Lucy", "Garfield", "Tom", "Sylvester"]
let count = cats.count
for i in 0..<count {
print("Cat \(i + 1) is called \(cats[i])")
}
// Person 1 is called Anna
// Person 2 is called Alex
// Person 3 is called Brian
// Person 4 is called JackOne-Sided Ranges
The last operator we will learn is the One-sided range. By using this operator, we can produce a sequence as much as we want by choosing a starting point, provided that we move in one direction.
The sentence was a little confusing, right?
Let's learn how to use this operator by giving an example.
let names = ["Leo", "Lucy", "Garfield", "Tom"]
for name in names[2...] {
print(name)
}
// Brian
// Jack
for name in names[...2] {
print(name)
}
// Anna
// Alex
// BrianCongratulations
Congratulations 🎉
In this section, we learned the concept of Range operator that we will use frequently in our codes.
See you in the next lesson 💯
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Frequently Asked Questions
Is the “Range Operators” lesson free?
Yes — any 3 lessons of the Swift Academy learning path, including “Range Operators”, 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 1 lessons in total.
What will I learn in “Range Operators”?
Range Operators 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 1 of 1.
How long does the “Range Operators” 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.