Question

How to extract the unique integers from an array excluding duplicates in Swift

Answer 1

func getUniqueExcludeDuplicates(arr: [Int]) -> [Int] {
    // Dictionary to count occurrences of each number
    var frequency: [Int: Int] = [:]

    // Count frequencies of each number in the array
    for num in arr {
        frequency[num, default: 0] += 1
    }

    // Collect numbers that appear only once
    return arr.filter { num in frequency[num] == 1 }
}

let arr = [1, 2, 3, 5, 8, 3, 1, 1, 0, 6, 5, 7, 3, 1, 4, 9]

let uniqueValues = getUniqueExcludeDuplicates(arr: arr)

print("Unique values (excluding duplicates):", uniqueValues.map { String($0) }.joined(separator: " "))

 
 
/*
run:

Unique values (excluding duplicates): 2 8 0 6 7 4 9
 
*/

 

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