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# Kotlin convert Map to SortedMap

loizenai
Software Engineer - Founder at https://loizenai.com

https://grokonez.com/kotlin/kotlin-convert-map-sortedmap

Kotlin convert Map to SortedMap

In the tutorial, JavaSampleApproach will show you how to convert Kotlin Map to SortedMap.

## I. Convert Kotlin Map to SortedMap

### 1. using toSortedMap()

Method signature:

``public fun <K : Comparable<K>, V> Map<out K, V>.toSortedMap(): SortedMap<K, V> = TreeMap(this)``

-> Converts a Map to a SortedMap so iteration order will be in key order.

Practice:

``````
val simpleMap = mapOf(Pair(4, "four"), Pair(8, "eight"), Pair(5, "five"), Pair(7, "seven"), Pair(10, "ten"), Pair(1, "one"))
println(simpleMap)
/*
{4=four, 8=eight, 5=five, 7=seven, 10=ten, 1=one}
*/

val sortedMap = simpleMap.toSortedMap();
println(sortedMap)
/*
{1=one, 4=four, 5=five, 7=seven, 8=eight, 10=ten}
*/``````

### 2. using toSortedMap() with Comparator

Method signature:

``public fun <K, V> Map<out K, V>.toSortedMap(comparator: Comparator<in K>): SortedMap<K, V>``

-> Converts a Map to a SortedMap with comparator so that iteration order will be in the order defined by the comparator.

Practice:

More at:

https://grokonez.com/kotlin/kotlin-convert-map-sortedmap

Kotlin convert Map to SortedMap