var json =
[
{
id: 11,
name:"app1",
family:"apps",
caseID: 123,
order:1
},
{
id: 12,
name:"app1",
family:"apps",
caseID: 123,
order:2
},
{
id: 13,
name:"app1",
family:"apps",
caseID: 123,
order:3
},
{
id: 14,
name:"app2",
family:"tools",
caseID: 129,
order:1
},
{
id: 15,
name:"app2",
family:"tools",
caseID: 129,
order:2
},
{
id: 16,
name:"app3",
family:"utils",
caseID: 120,
order:1
},
{
id: 17,
name:"app3",
family:"utils",
caseID: 120,
order:2
},
id: 18,
name:"app3",
family:"utils",
caseID: 150,
order:null
}
]
您好，我想通过最高的“order”键对上面的数组进行排序，并返回下面的过滤数组。公共密钥是caseID。此外，如果订单键为null，则返回它。 我已经搜索并测试了一些函数和循环，但似乎无法得到它。任何帮助都感激不尽。如果可能的话，我更喜欢es2015。 谢谢！
filtered =
[
{
id: 13,
name:"app1",
family:"apps",
caseID: 123,
order:3
},
{
id: 15,
name:"app2",
family:"tools",
caseID: 129,
order:2
},
{
id: 17,
name:"app3",
family:"utils",
caseID: 120,
order:2
},
{
id: 18,
name:"app3",
family:"utils",
caseID: 150,
order:null
}
]
答案 0 :(得分：2)
我首先要摆脱欺骗。您可以使用reduce()执行此操作并指定一个键入caseID的对象。您可以同时避免使用比您已经看到的order更小的任何对象。然后，您可以获取该散列的值，该散列将是caseID上的唯一对象，并按照您通常的方式对它们进行排序。例如：
var json = [{ "id": 11, "name":"app1", "family":"apps", "caseID": 123, "order":1},{ "id": 12, "name":"app1", "family":"apps", "caseID": 123, "order":2},{ "id": 13, "name":"app1", "family":"apps", "caseID": 123, "order":3},{ "id": 14, "name":"app2", "family":"tools", "caseID": 129, "order":1},{ "id": 15, "name":"app2", "family":"tools", "caseID": 129, "order":2},{ "id": 16, "name":"app3", "family":"utils", "caseID": 120, "order":1},{ "id": 17, "name":"app3", "family":"utils", "caseID": 120, "order":2},{ "id": 18, "name":"app3", "family":"utils", "caseID": 150, "order":null},]
// get just the filtered items based on caseID
// picking out only the largest
let filtered = json.reduce((a,c) => {
if (!a[c.caseID] || a[c.caseID]['order'] < c.order) a[c.caseID] = c
return a
}, {})
// basic sort
let result = Object.values(filtered).sort((a,b) => b.order - a.order)
console.log(result)
答案 1 :(得分：2)
如果caseID更高，您可以使用order哈希表并覆盖以后找到的结果：
const result = [], hash = {};
for(const el in json) {
const exists = hash[el.caseId];
if(exists) {
if(el.order > exists.order)
Object.assign(exists, el);
} else {
result.push(hash[el.caseId] = {...el});
}
}
答案 2 :(得分：0)
您可以尝试以下
方式
// Code goes here
var json = [{"id":11,"name":"app1","family":"apps","caseID":123,"order":1},{"id":12,"name":"app1","family":"apps","caseID":123,"order":2},{"id":13,"name":"app1","family":"apps","caseID":123,"order":3},{"id":14,"name":"app2","family":"tools","caseID":129,"order":1},{"id":15,"name":"app2","family":"tools","caseID":129,"order":2},{"id":16,"name":"app3","family":"utils","caseID":120,"order":1},{"id":17,"name":"app3","family":"utils","caseID":120,"order":2},{"id":18,"name":"app3","family":"utils","caseID":150,"order":null}];
var map = {};
// Create a map of unique case ID's with highest order
json.forEach((item) => {
if(map[item.caseID]) {
if(map[item.caseID].order < item.order) {
map[item.caseID] = item;
}
} else {
map[item.caseID] = item;
}
});
// Sorting the array based on order
var result = Object.values(map).sort((a,b) => b.order-a.order);
console.log(result);
答案 3 :(得分：0)
在ES6中：
private void btn_LoadFile_Click(object sender, EventArgs e)
{
OpenFileDialog fdlg = new OpenFileDialog();
if (fdlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
System.IO.StreamReader sr = new
System.IO.StreamReader(fdlg.FileName);
string[] lines = sr.ReadToEnd().Split('\n');
PrintText(tb_SerialNo, lines[0]);
PrintText(tb_TypeNo , lines[1]);
PrintText(tb_TestEngineer, lines[2]);
PrintText(tb_Date, lines[3]);
PrintText(tb_Test1, lines[4]);
PrintText(tb_Test2, lines[5]);
}
}
private void PrintText(TextBox control, string line)
{
var splitline = line.Split('=');
control.Text = splitline[1];
}
在ES5中：
json.sort((a, b) => a.caseID > b.caseID);
let bad_order = json.filter(v => v.order === null);
let good_order = json.filter(v => v.order !== null);
答案 4 :(得分：0)
使用reduce方法创建一个对象，其中的键将是caseID。创建对象时，检查订单的值是否大于或等于当前订单的值。如果是当前的订单值。 value小于新值，将其替换为新值。
然后使用Object.values(object)从对象
var json = [{
"id": 11,
"name": "app1",
"family": "apps",
"caseID": 123,
"order": 1
},
{
"id": 12,
"name": "app1",
"family": "apps",
"caseID": 123,
"order": 2
},
{
"id": 13,
"name": "app1",
"family": "apps",
"caseID": 123,
"order": 3
},
{
"id": 14,
"name": "app2",
"family": "tools",
"caseID": 129,
"order": 1
},
{
"id": 15,
"name": "app2",
"family": "tools",
"caseID": 129,
"order": 2
},
{
"id": 16,
"name": "app3",
"family": "utils",
"caseID": 120,
"order": 1
},
{
"id": 17,
"name": "app3",
"family": "utils",
"caseID": 120,
"order": 2
}, {
"id": 18,
"name": "app3",
"family": "utils",
"caseID": 150,
"order": null
}
]
var m = json.reduce(function(acc, curr, index) {
if (acc[curr['caseID']] === undefined) {
acc[curr['caseID']] = curr;
} else {
if (acc[curr['caseID']].order < curr.order) {
acc[curr['caseID']] = curr;
}
}
return acc;
}, {})
console.log(Object.values(m))
答案 5 :(得分：0)
这可以帮助您过滤对象数组。
var filteredMap = {};
json.forEach(function (item) {
filteredMap[item.caseID] = item;
});
var filteredArray = [];
for (var key in filteredMap) {
filteredArray.push(filteredMap[key]);
}
console.log(JSON.stringify(filteredArray));
答案 6 :(得分：0)
按顺序和caseID排序，然后按caseID过滤，这是代码：
var json =
[
{
id: 11,
name:"app1",
family:"apps",
caseID: 123,
order:1
},
{
id: 12,
name:"app1",
family:"apps",
caseID: 123,
order:2
},
{
id: 13,
name:"app1",
family:"apps",
caseID: 123,
order:3
},
{
id: 14,
name:"app2",
family:"tools",
caseID: 129,
order:1
},
{
id: 15,
name:"app2",
family:"tools",
caseID: 129,
order:2
},
{
id: 16,
name:"app3",
family:"utils",
caseID: 120,
order:1
},
{
id: 17,
name:"app3",
family:"utils",
caseID: 120,
order:2
}, {
id: 18,
name:"app3",
family:"utils",
caseID: 150,
order:null
}
]
var obj = {}
var arr = json.sort(function(a, b) {
return b.order - a.order
}).sort(function(a, b) {
return a.caseId - b.caseId
}).filter(function(item, index, array){
return obj.hasOwnProperty(item.caseID) ? false : (obj[item.caseID] = true)
})
console.log(arr)