1748-sum-of-unique-elements

DevGod

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DevGod needs to write an editorial for this problem!

js

/**
 * @param {number[]} nums
 * @return {number}
 */
var sumOfUnique = function(nums) {
    return _.toPairs(_.countBy(nums)).reduce( (sum,el)=>sum += el[1] == 1 ? Number(el[0]) : 0,0 )
};