Question

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

Answer 1

function getUniqueExcludeDuplicates(arr: number[]): number[] {
    // Object to count occurrences of each number
    const frequency: Record<number, number> = {};

    // Count frequencies of each number in the array
    arr.forEach(num => {
        frequency[num] = (frequency[num] || 0) + 1;
    });

    // Collect numbers that appear only once
    const result: number[] = arr.filter(num => frequency[num] === 1);

    return result;
}

const arr: number[] = [1, 2, 3, 5, 8, 3, 1, 1, 0, 6, 5, 7, 3, 1, 4, 9];

const uniqueValues: number[] = getUniqueExcludeDuplicates(arr);

console.log("Unique values (excluding duplicates):", uniqueValues.join(" "));



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

 

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