Sum Nmbers in Range (using maths formula...neat cheat)

1

Hi, thought I’d use some old well known maths algorithm for the sum of an arithmetic series, after sorting the array, taking the difference plus 1 to get the number of terms etc…

function sumAll(arr) {

let sortArr = arr.sort( (a, b) => a > b);

let n = (sortArr[1] - sortArr[0] + 1);

return n/2 *[2 * sortArr[0] + (n - 1)*1 ];

}

sumAll([1, 4]);

2

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