使用 JavaScript 将 JSON 中的相似项目分组
javascriptweb developmentfront end technologyobject oriented programmingjson
假设我们有一个 JSON 数组，其中包含一些票证的数据，如下所示 −
const arr = [
{
"quantity": "1",
"description": "VIP Ticket to Event"
},
{
"quantity": "1",
"description": "VIP Ticket to Event"
},
{
"quantity": "1",
"description": "VIP Ticket to Event"
},
{
"quantity": "1",
"description": "Regular Ticket to Event"
},
{
"quantity": "1",
"description": "Regular Ticket to Event"
},
];
我们需要编写一个 JavaScript 函数来接收一个这样的数组。该函数应该将相似的对象分组在一起并总结它们的数量属性。
如果两个对象的"description"属性值相同，则将考虑这两个对象。
示例
其代码为 −
const arr = [
{
"quantity": "1",
"description": "VIP Ticket to Event"
},
{
"quantity": "1",
"description": "VIP Ticket to Event"
},
{
"quantity": "1",
"description": "VIP Ticket to Event"
},
{
"quantity": "1",
"description": "Regular Ticket to Event"
},
{
"quantity": "1",
"description": "Regular Ticket to Event"
},
];
const groupAndAdd = arr => {
const res = [];
arr.forEach(el => {
if (!this[el.description]) {
this[el.description] = {
description: el.description, quantity: 0
};
res.push(this[el.description]);
};
this[el.description].quantity += +el.quantity;
}, {});
return res;
}
console.log(groupAndAdd(arr));
输出
控制台中的输出将是 −
[
{ description: 'VIP Ticket to Event', quantity: 3 },
{ description: 'Regular Ticket to Event', quantity: 2 }
]
