2024-06-21

Writerside/topics/Collection.md

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+# 컬렉션
+
+- listOf()
+
+- setOf()
+
+- mapOf()
+
+- mutableListOf()
+
+- mutableSetOf()
+
+- mutableMapOf()
+
+
+```kotlin
+val numberSet = setOf("one", "two", "three")
+val emptySet = mutableSetOf<String>()
+```
+
+```kotlin
+val numberMap = mapOf("one" to 1, "two" to 2, "three" to 3)
+```
+
+## 빌더 함수
+
+- buildList()
+
+- buildSet()
+
+- buildMap()
+
+
+```kotlin
+val map = buildMap{
+    put("a", 1)
+    put("b", 2)
+}
+```
+
+## 빈 컬렉션
+
+- emptyList()
+
+- emptySet()
+
+- emptyMap()
+
+
+```kotlin
+val empty = emptyList<String>()
+```
+
+## 복제
+
+- toList()
+
+- toMutableList()
+
+- toSet()