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Kotlin Lists

Process an ordered collection.

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The concept

listOf creates a read-only list. A for loop visits each item in order and prints it.

Kotlin

fun main() {
    val scores = listOf(82, 91, 76)
    for (score in scores) {
        println(score)
    }
}

Output

82
91
76

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1fun main() {

2 val scores = listOf(82, 91, 76)

3 for (score in scores) {

4 println(score)

5 }

6}

Start to inspect the source, values, and output. These prepared steps explain the published sample; grouped loop steps describe multiple iterations.

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Prepared trace of the published program. Some rows group repeated iterations.
What happens	State after step	Output so far
Create a list containing three scores.	`scores = [82, 91, 76]`	—
Visit each score in sequence.	`scores = [82, 91, 76]`	—
Print each visited value.	`scores = [82, 91, 76]`	82 91 76

How Kotlin processes this code

Kotlin commonly compiles to JVM bytecode, which the JVM executes.