How to Iterate Over a List in Kotlin - Step by Step Examples

How to Iterate Over a List in Kotlin ?

Answer

To iterate over a list in Kotlin, you can use various methods such as for loop, forEach method, forEachIndexed method, etc.

✐ Examples

1 Iterate Over a List using for Loop

In this example,

We create a list named listOfNumbers containing integer values.
We use a for loop to iterate over each element in the listOfNumbers.
Inside the loop, we print each element to standard output.

Kotlin Program

fun main() {
    val listOfNumbers = listOf(1, 2, 3, 4, 5)
    for (number in listOfNumbers) {
        println(number)
    }
}

Output

2 Iterate Over a List using forEach Method

In this example,

We create a list named listOfColors containing string values.
We use the forEach method on listOfColors to iterate over each element in the list.
Inside the forEach lambda, we print each element to standard output.

Kotlin Program

fun main() {
    val listOfColors = listOf("Red", "Green", "Blue", "Yellow", "Orange")
    listOfColors.forEach { color ->
        println(color)
    }
}

Output

Red
Green
Blue
Yellow
Orange

3 Iterate Over a List using forEachIndexed Method

In this example,

We create a list named listOfNames containing string values.
We use the forEachIndexed method on listOfNames to iterate over each element in the list along with its index.
Inside the forEachIndexed lambda, we print the index and each element to standard output.

Kotlin Program

fun main() {
    val listOfNames = listOf("Alice", "Bob", "Charlie", "David", "Emily")
    listOfNames.forEachIndexed { index, name ->
        println("Index: $index, Name: $name")
    }
}

Output

Index: 0, Name: Alice
Index: 1, Name: Bob
Index: 2, Name: Charlie
Index: 3, Name: David
Index: 4, Name: Emily

Summary

In this tutorial, we learned How to Iterate Over a List in Kotlin language with well detailed examples.

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How to Iterate Over a List in Kotlin - Step by Step Examples

How to Iterate Over a List in Kotlin ?

Answer

✐ Examples

1 Iterate Over a List using for Loop

Kotlin Program

Output

2 Iterate Over a List using forEach Method

Kotlin Program

Output

3 Iterate Over a List using forEachIndexed Method

Kotlin Program

Output

Summary

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