[Kotlin]

1.[Kotlin] StringTokenizer

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2.[Kotlin] StringBuilder

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3.[Kotlin] val, var

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4.[Kotlin] for, while, do while

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5.[Kotlin] sum, sumOf

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6.[Kotlin] emptyArray, emptyList, emptyMap, emptySet

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7.[Kotlin]함수 - toArray, toList, toMap, toSet

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8.[Kotlin]문법 - 자료형

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9.[Kotlin] fold, reduce

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10.[Kotlin] slice

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11.[Kotlin] first, last

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12.[Kotlin] index, indexOf, lastIndexOf

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13.[Kotlin] sort, sortDescending, sortBy, sortByDescending, sortWith, compareBy

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14.[Kotlin] toString, toInt, digitToInt

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15.[Kotlin] repeat, takeLast

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16.[Kotlin] groupBy

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17.[Kotlin] subList, substring

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18.[Kotlin] take, drop

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19.[Kotlin] chunked

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20.[Kotlin] ArrayDeque

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