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Destructuring Declarations in Kotlin - Cleverson Zanon | cleverson.ssantos1008@gmail.com (#2318)

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* Different Types of Bean Injection in Spring code

* Dataclasses in Kotlin

* Revert "Different Types of Bean Injection in Spring code"

This reverts commit 4b747726b93a9f6bf76d6518792fc77e0d5c2fc9.

* Destructuring Declarations in Kotlin

* Corrections on Destructuring Declarations in Kotlin
This commit is contained in:
cleversonzanon 2017-07-28 17:51:16 -03:00 committed by Grzegorz Piwowarek
parent 9b143b820c
commit 7f22e3dc35
1 changed files with 5 additions and 16 deletions
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19
kotlin/src/main/kotlin/com/baeldung/destructuringdeclarations/Sandbox.kt
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@ -1,7 +1,6 @@
package com.baeldung.destructuringdeclarations package com.baeldung.destructuringdeclarations
import com.baeldung.destructuringdeclarations.Person import com.baeldung.destructuringdeclarations.Person
import com.baeldung.destructuringdeclarations.Result
fun main(args: Array<String>) { fun main(args: Array<String>) {
@ -13,20 +12,15 @@ fun main(args: Array<String>) {
println(name) //Jon Snow println(name) //Jon Snow
println(age) //20 println(age) //20
//The equivalent of line 10
/* val id = person.component1();
val name = person.component2();
val age = person.component3();*/
//2.2. Functions //2.2. Functions
fun getPersonInfo() = Person(2, "Ned Stark", 45) fun getPersonInfo() = Person(2, "Ned Stark", 45)
val(idf, namef, agef) = getPersonInfo() val(idf, namef, agef) = getPersonInfo()
fun twoValuesReturn(): Result { fun twoValuesReturn(): Pair<Int, String> {
// needed code // needed code
return Result(1, "success") return Pair(1, "success")
} }
// Now, to use this function: // Now, to use this function:
@ -41,15 +35,10 @@ fun main(args: Array<String>) {
} }
//2.4. Underscore and Destructuring in Lambdas //2.4. Underscore and Destructuring in Lambdas
val (_, status2) = twoValuesReturn() val (_, name2, age2) = person
val (id3, name3) = person
map.mapValues { entry -> "${entry.value}!" } map.mapValues { entry -> "${entry.value}!" }
map.mapValues { (key, value) -> "$value!" } map.mapValues { (key, value) -> "$value!" }
//A pair of parameters vs. a destructuring pair
/* { a -> ... } // one parameter
{ a, b -> ... } // two parameters
{ (a, b) -> ... } // a destructured pair
{ (a, b), c -> ... } // a destructured pair and another parameter*/
} }