Kotlin Map size
Syntax & Examples

Syntax of Map.size

The syntax of Map.size property is:

abstract val size: Int

This size property of Map returns the number of key/value pairs in the map.

✐ Examples

1 Get size of a map with integer keys and character values

In this example,

We create a map named map with integer keys and character values.
We access the size property of the map to get the number of key/value pairs.
We then print the size to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val map = mapOf(1 to 'a', 2 to 'b', 3 to 'c')
    val size = map.size
    println(size)
}

Output

2 Get size of a map with string keys and integer values

In this example,

We create a map named map with string keys and integer values.
We access the size property of the map to get the number of key/value pairs.
We then print the size to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val map = mapOf("apple" to 1, "banana" to 2, "cherry" to 3)
    val size = map.size
    println(size)
}

Output

3 Print size of a map using string interpolation

In this example,

We create a map named map with integer keys and character values.
We directly print the size of map using string interpolation.
The size of the map is interpolated into the output string.

Kotlin Program

fun main(args: Array<String>) {
    val map = mapOf(1 to 'a', 2 to 'b', 3 to 'c')
    println("Size of the map: $map.size")
}

Output

Size of the map: 3

Summary

In this Kotlin tutorial, we learned about size property of Map: the syntax and few working examples with output and detailed explanation for each example.