let matrix = []; for (let i = 0, x = 10; i < 4; i += 1) { let row = []; for (let j = 0; j < 5; j += 1, x += 2) { row.push(x); } matrix.push(row); } console.log(matrix);
Array.from({length: 10}, (x, i) => i * 2);