javascript 求和范围内的所有数字

Posted 2021-05-03

function sumAll(arr) {
  var max = Math.max(...arr);
  var min = Math.min(...arr) + 1;
  var newArr = [];
  for (var i = min; i < max; i++) {
   newArr.push(i); 
  }
  let finalArr = [...newArr, ...arr];
  return finalArr.reduce((acc, val) => {
    return acc + val;
  });
}

sumAll([1, 4]);