Question

How to sum all the unique numbers in array with Node.js

Answer 1

const sumUniqueNumbers = arr => {
    let result = 0;
    
    for (let i = 0; i < arr.length; i++) {
        if (arr.indexOf(arr[i]) !== arr.lastIndexOf(arr[i])) {
            continue;
        };
        result += arr[i];
    };
    
    return result;
};

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

// 4 + 7 + 8 + 9 + 6 = 34

console.log(sumUniqueNumbers(arr));



/*
run:

34

*/

 

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