Online Node.js Compiler

const arr = [6, 2, 15]; const sumDifference = (arr = []) => { const descArr = arr.sort((a, b) => b - a); if (descArr.length <= 1) { return 0; } let total = 0; for (let i = 0; i < descArr.length - 1; i++) { total += (descArr[i] - descArr[i + 1]); } return total; }; console.log(sumDifference(arr));