Массив частичной суммы

const accumulate = (…nums) =>
  nums.reduce((acc, n) => […acc, n + (acc.slice(-1)[0] || 0)], []);

accumulate(1, 2, 3, 4); // [1, 3, 6, 10]
accumulate(…[1, 2, 3, 4]); // [1, 3, 6, 10]