목록Kotlin (32)

달나라 노트

Kotlin - first, last, firstOrNull, lastOrNull

Original source = play.kotlinlang.org/byExample/01_introduction/01_Hello%20world fun main() { var list_fruit = listOf("Apple", "PineApple", "Red_Strawberry", "Red_Apple", "Yellow_Banana", "Yellow_Yellowmelon") // 1 var var_first = list_fruit.first() // 2 println(var_first) var var_last = list_fruit.last() // 3 println(var_last) var var_first_apple = list_fruit.first() {x -> x.contains("Apple")} ..
Kotlin 2021. 3. 16. 00:07
Kotlin - find, findLast

Original source = play.kotlinlang.org/byExample/01_introduction/01_Hello%20world fun main() { var list_fruit = listOf("Apple", "PineApple", "Red_Strawberry", "Red_Apple", "Yellow_Banana", "Yellow_Yellowmelon") // 1 var var_first = list_fruit.find {x -> x.startsWith("Red", ignoreCase=true)} // 2 println(var_first) var var_last = list_fruit.findLast {it.startsWith("Red", ignoreCase=true)} // 3 pri..
Kotlin 2021. 3. 15. 23:53
Kotlin - all, any, none

Original source = play.kotlinlang.org/byExample/01_introduction/01_Hello%20world fun main() { var list_numbers = listOf(1, -1, 2, -2, 3, -3, 4, -4, 5, -5) // 1 var var_all_even = list_numbers.all {x -> x % 2 == 0} // 2 println(var_all_even) var var_all_lt_100 = list_numbers.all {it x < 0} // 4 println(var_any_negat..
Kotlin 2021. 3. 15. 23:41
Kotlin - map function

Original source = play.kotlinlang.org/byExample/01_introduction/01_Hello%20world Kotlin의 map function은 list의 각 요소에 어떤 로직을 적용하여 그 결과를 담은 list를 return합니다. fun main() { var list_numbers = listOf(1, -1, 2, -2, 3, -3, 4, -4, 5, -5) // 1 var list_doubled = list_numbers.map {x -> x * 2} // 2 var list_negative = list_numbers.map {y -> y * (-1)} // 3 var list_even = list_numbers.map {z -> z % 2 == 0 } //..
Kotlin 2021. 3. 15. 23:30
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