let prod = 1, sum = 0; const x = 5, y = -5, z = -2; const one = 1, three = 3, seven = 7; function process(j) { sum += Math.abs(j); if (Math.abs(prod) < 2 ** 27 && j !== 0) { prod *= j; } } function multifor(f, arr) { function wraploop(start, stop, step = 1) { for (let j = start; Math.abs(j) <= Math.abs(stop); j += step) { f(j); } } for (const subarr of arr) { wraploop(...subarr); } } const test_ranges = [[-three, 3 ** 3, three], [-seven, seven, x], [555, 550 - y], [22, -28, -three], [1927, 1939], [x, y, z], [11 ** x, 11 ** x + one]]; multifor(process, test_ranges); console.log(`Sum: ${sum}`); console.log(`Product: ${prod}`);