Harry Nguyen

Harry Nguyen

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Kotlin – Convert Map to/from Properties

 


https://ozenero.com/kotlin-convert-map-tofrom-properties

In the post, we show how to convert ‘Kotlin Map to Properties’ and versus case ‘Properties to Kotlin Map’.

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Kotlin - Convert Map to/from Properties » grokonez

https://grokonez.com/kotlin/kotlin-convert-map-tofrom-properties

Kotlin – Convert Map to/from Properties

In the post, we show how to convert ‘Kotlin Map to Properties’ and versus case ‘Properties to Kotlin Map’.

I. Kotlin - Convert Map to Properties

Use toProperties() method of Map class, -> Method signature:

fun Map.toProperties(): Properties

Practice:


package com.javasampleapproach.kotlin.map2properties

fun main(args: Array) {
	val map = mutableMapOf()
	map.put("db.username", "username")
	map.put("db.password", "password")
	map.put("db.driver", "org.postgresql.Driver")
	map.put("db.url", "jdbc:postgresql://localhost/testdb")
	
	// Converts this [Map] to a [Properties] object.
	// use -> fun Map.toProperties(): Properties
	val propertiesOfMap = map.toProperties()
	
	// Traverse through propertiesOfMap
	propertiesOfMap.forEach{(k, v) -> println("key=$k, value=$v")}
	/*
		key=db.password, value=password
		key=db.url, value=jdbc:postgresql://localhost/testdb
		key=db.username, value=username
		key=db.driver, value=org.postgresql.Driver
	 */
}

II. Kotlin - Convert Properties to Map

Iterate through Properties object by forEach or for-loop statement then manually use put(key: K, value: V) method of Map interface.

Practice:

More at:

https://grokonez.com/kotlin/kotlin-convert-map-tofrom-properties

Kotlin – Convert Map to/from Properties

#kotlin #properties #map

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Convert Kotlin Map to List » grokonez

https://grokonez.com/kotlin/kotlin-tutorial-convert-kotlin-map-list

Convert Kotlin Map to List

In the tutorial, Grokonez will show you how to convert Kotlin Map to List.

Related posts:

I. Convert Kotlin Map to List

1. Basic Method

- Use public fun Map.toList(): List> to returns a [List] containing all key-value pairs

val simpleMap = hashMapOf("foo" to 1, "bar" to 2)
val pairKeyValueList = simpleMap.toList()
println(pairKeyValueList) // [(bar, 2), (foo, 1)]
  • Use public Collection values() to return a view of the values:

val valueList = simpleMap.values
println(valueList) // [2, 1]
  • Use public Set keySet() to return a set view of the keys:

val keyList = simpleMap.keys
println(keyList) // [bar, foo]

2. Map Object

- When working with Map Object, we can associate with map(transform: (T) -> R) function to customize a returned-list:

More at:

https://grokonez.com/kotlin/kotlin-tutorial-convert-kotlin-map-list

Convert Kotlin Map to List

#kotlin #kotlin-map #kotlin-list

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