Using Set
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Creating sets in Kotlin
Sets are unordered collections of elements. Like the methods for creating List<T>
, which has both immutable/read-only and mutable/read-write versions, you may create instances of Set<T>
using setOf()
or instances of MutableSet<T>
using mutableSetOf()
. You may also use hashSetOf()
to get a reference of type java.util.HashSet<T>
: linkedSetOf()
for LinkedHashSet
, and sortedSetOf()
for TreeSet<T>
.
Here’s a set of fruits, with a duplicate element:
// sets.kts
val fruits: Set<String> = setOf("Apple", "Banana", "Apple")
Since sets guarantee uniqueness of elements, the duplicate is discarded in the set created:
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