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6. Square and sum the elements of this array using arrow functions and in 1 line of code. Then find the average of the array. let nums = [25, 45, 55, 77, 88, 99]; 7. Sort the in ascending, descending order [18,47,56,65,47,73,28,18] Note that you must use JavaScript features and capabilities such as arrow functions, array functions (.map, reduce,.filter, .splice, .sort...) and spread operator