Question

How to remove duplicate elements from a list of strings in Kotlin

Answer 1

fun removeDuplicates(elements: List<String>): List<String> {
    val encountered = HashSet<String>()
    val result = ArrayList<String>()

    for (element in elements) {
        if (encountered.add(element)) {
            result.add(element)
        }
    }

    return result
}

fun main() {
    val elements = listOf("aaa", "bbb", "ccc", "ddd", "eee", "aaa", "www", "ddd", "bbb", "aaa")
    
    println(elements)
    
    println(removeDuplicates(elements))
}

  
   
/*
run:

[aaa, bbb, ccc, ddd, eee, aaa, www, ddd, bbb, aaa]
[aaa, bbb, ccc, ddd, eee, www]
 
*/

 

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