返回修改后的值

refactorgram

let totalAscent = 0;
calculateAscent();

function calculateAscent() {
  for (let i = 1; i < points.length; i++) {
    const verticalChange = points[i].elevation - points[i-1].elevation;
    totalAscent += (verticalChange > 0) ? verticalChange : 0;
  }
}

const totalAscent = calculateAscent();

function calculateAscent() {
  let result = 0;
  for (let i = 1; i < points.length; i++) {
    const verticalChange = points[i].elevation - points[i-1].elevation;
    result += (verticalChange > 0) ? verticalChange : 0;
  }
  return result;
}