2778-sum-of-squares-of-special-elements

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js

/**
 * @param {number[]} nums
 * @return {number}
 */
var sumOfSquares = function(nums) {
    return nums.reduce(
        (sum,el,I)=> sum += (nums.length%(I+1)) == 0 ? el**2 : 0
        ,0
    );
};