KOTLIN Tutorial

Ranges in Kotlin

Ranges represent a sequence of values that you can iterate over. They are often used in loops and condition checks.

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1. Creating a Range

Use start..end to define a range. It includes both endpoints.

fun main() {
    val range = 1..5
    for (i in range) {
        print("$i ")
    }
}
  

Output: 1 2 3 4 5

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2. Using downTo

To count in reverse order, use downTo.

fun main() {
    for (i in 5 downTo 1) {
        print("$i ")
    }
}
  

Output: 5 4 3 2 1

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3. Skipping with step

You can skip values by adding step after the range.

fun main() {
    for (i in 1..10 step 2) {
        print("$i ")
    }
}
  

Output: 1 3 5 7 9

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4. Checking if Value Exists

Use in or !in to test if a value exists in a range.

fun main() {
    val x = 7
    if (x in 1..10) {
        println("$x is in the range")
    }
}
  

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5. Character Ranges

Ranges aren't limited to numbers — you can create ranges of characters too.

fun main() {
    for (ch in 'A'..'F') {
        print("$ch ")
    }
}
  

Output: A B C D E F

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Summary

• a..b — from a to b
• b downTo a — reverse
• step — skip steps
• in — check existence
• Works with numbers and characters