在id相同的陣列中添加值

(14) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}]
0: {itemId: 'F4', itemRate: 20, Amount: 20, itemName: 'Kesar pista', itemQuantity: 1}
1: {itemName: 'Vegetable manchuri', itemRate: 60, itemId: 'G5', Amount: 120, itemQuantity: 2}
2: {itemRate: 50, Amount: 50, itemQuantity: 1, itemId: 'C10', itemName: 'Dry fruit '}
3: {itemId: 'C3', itemRate: 40, itemQuantity: 1, Amount: 40, itemName: 'Butter scotch'}
4: {itemName: 'Panner sandwich   milk shake', Amount: 90, itemId: 'CS4', itemRate: 90, itemQuantity: 1}
5: {itemQuantity: 1, itemId: 'B5', itemRate: 70, Amount: 70, itemName: 'Panner burger'}
6: {itemId: 'C10', itemQuantity: 1, Amount: 50, itemName: 'Dry fruit ', itemRate: 50}
7: {itemQuantity: 2, itemName: 'American nuts', Amount: 100, itemRate: 50, itemId: 'C8'}
8: {itemName: 'Mango ', Amount: 50, itemQuantity: 1, itemId: 'C7', itemRate: 50}
9: {Amount: 40, itemId: 'C6', itemQuantity: 1, itemName: 'Choclate ', itemRate: 40}
10: {itemRate: 40, itemId: 'C3', itemQuantity: 1, Amount: 40, itemName: 'Butter scotch'}
11: {itemRate: 45, itemId: 'B1', itemName: 'Veg burger', Amount: 45, itemQuantity: 1}
12: {itemName: 'Veg cheese', Amount: 55, itemId: 'B2', itemQuantity: 1, itemRate: 55}
13: {itemName: 'Vanila', itemQuantity: 1, itemId: 'C1', Amount: 30, itemRate: 30}
length: 14
[[Prototype]]: Array(0)

我有一個陣列。在陣列中有 2 個 [id] 值是相同的。我想添加這些元素的數量和比率，并使用 javascript 合并 [id] 相同的元素。我曾嘗試以下方法，但它顯示錯誤的值。

 let result = Object.values(this.orderDetail.reduce((c, {itemId,itemRate,itemQuantity,itemName}) => {
              c[itemId] = c[itemId] || {itemId,itemRate,itemQuantity,itemName: 0};
              c[itemId].itemRate  = itemRate;
              c[itemId].itemQuantity  = itemQuantity;
              c[itemId].itemName = itemName;
              return c;
            }, {}));

結果

uj5u.com熱心網友回復：

當我查看結果時，有一次額外的時間所有值都傳遞給它。我想您應該嘗試將默認值零或空字串傳遞給它。

uj5u.com熱心網友回復：

問題在于累加器中的第一行。

c[itemId] = c[itemId] || {itemId,itemRate,itemQuantity,itemName: 0};

您應該在此處分配初始值。這應該如下

c[itemId] = c[itemId] || { itemId, itemRate: 0, itemQuantity: 0, itemName: '', Amount: 0 };

否則，您將兩次將第一個值添加到累加器中。

作業小提琴

const data = [{ itemId: 'F4', itemRate: 20, Amount: 20, itemName: 'Kesar pista', itemQuantity: 1 },
  { itemId: 'G5', itemName: 'Vegetable manchuri', itemRate: 60, Amount: 120, itemQuantity: 2 },
  { itemId: 'C10', itemRate: 50, Amount: 50, itemQuantity: 1, itemName: 'Dry fruit ' },
  { itemId: 'C3', itemRate: 40, itemQuantity: 1, Amount: 40, itemName: 'Butter scotch' },
  { itemId: 'CS4', itemName: 'Panner sandwich   milk shake', Amount: 90, itemRate: 90, itemQuantity: 1 },
  { itemId: 'B5', itemQuantity: 1, itemRate: 70, Amount: 70, itemName: 'Panner burger' },
  { itemId: 'C10', itemQuantity: 1, Amount: 50, itemName: 'Dry fruit ', itemRate: 50 },
  { itemId: 'C8', itemQuantity: 2, itemName: 'American nuts', Amount: 100, itemRate: 50 },
  { itemId: 'C7', itemName: 'Mango ', Amount: 50, itemQuantity: 1, itemRate: 50 },
  { itemId: 'C6', Amount: 40, itemQuantity: 1, itemName: 'Choclate ', itemRate: 40 },
  { itemId: 'C3', itemRate: 40, itemQuantity: 1, Amount: 40, itemName: 'Butter scotch' },
  { itemId: 'B1', itemRate: 45, itemName: 'Veg burger', Amount: 45, itemQuantity: 1 },
  { itemId: 'B2', itemName: 'Veg cheese', Amount: 55, itemQuantity: 1, itemRate: 55 },
  { itemId: 'C1', itemName: 'Vanila', itemQuantity: 1, Amount: 30, itemRate: 30 },
];

let result = Object.values(data.reduce((c, { itemId, itemRate, itemQuantity, itemName, Amount }) => {
  const temp = { itemId, itemRate: 0, itemQuantity: 0, itemName: '', Amount: 0 };
  c[itemId] = c[itemId] || temp;
  c[itemId].itemRate  = itemRate;
  c[itemId].itemQuantity  = itemQuantity;
  c[itemId].itemName = itemName;
  c[itemId].Amount  = Amount;
  return c;
}, {}));
console.log(result);

標籤：javascript 数组 目的

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