Kotlin Map get()
Syntax & Examples

Syntax of Map.get()

The syntax of Map.get() function is:

abstract operator fun get(key: K): V?

This get() function of Map returns the value corresponding to the given key, or null if such a key is not present in the map.

✐ Examples

1 Get value corresponding to specified key (present)

In this example,

We create a map named map1 containing pairs of numbers and characters.
We then retrieve the value corresponding to the key 2 using the get() function.
As 2 is present in the keys of map1, the corresponding value 'b' is returned.
We print the result to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val map1 = mapOf(1 to 'a', 2 to 'b', 3 to 'c')
    val value1 = map1.get(2)
    println(value1)
}

Output

2 Get value corresponding to specified key (not present)

In this example,

We create a map named map2 containing pairs of characters and numbers.
We then attempt to retrieve the value corresponding to the key 'd' using the get() function.
As 'd' is not present in the keys of map2, null is returned.
We print the result to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val map2 = mapOf('a' to 1, 'b' to 2, 'c' to 3)
    val value2 = map2.get('d')
    println(value2)
}

Output

null

3 Get value corresponding to specified key (present)

In this example,

We create a map named map3 containing pairs of strings and numbers.
We then retrieve the value corresponding to the key 'banana' using the get() function.
As 'banana' is present in the keys of map3, the corresponding value 2 is returned.
We print the result to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val map3 = mapOf("apple" to 1, "banana" to 2, "cherry" to 3)
    val value3 = map3.get("banana")
    println(value3)
}

Output

Summary

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