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[英]How can I extend this AngularJS filter to sort alphabetically by object property?
[英]How can I sort an object alphabetically by value?
所以我有一個國家列表,默認情況下它們按 ISOA2 代碼排序,這是某種國家代碼。
說出這個清單:
{
"AD": "Andorra",
"AE": "United Arab Emirates",
"AF": "Afghanistan",
"AG": "Antigua and Barbuda",
"AI": "Anguilla",
"AL": "Albania",
"AM": "Armenia",
"AN": "Netherlands Antilles",
"GB": "United Kingdom"
}
我有這個代碼:
function sortObject(obj) {
return Object
.keys(obj)
.sort()
.reduce((a, v) => {
a[v] = obj[v];
return a;
}, {});
}
// data is the list of countries
const result = sortObject(data);
我正在嘗試使用該代碼對其進行排序,但它始終返回相同的列表。
我需要這個列表是這樣的:
{
"AF": "Afghanistan",
"AL": "Albania",
"AD": "Andorra",
"AI": "Anguilla",
"AG": "Antigua and Barbuda",
"AM": "Armenia",
"AN": "Netherlands Antilles",
"AE": "United Arab Emirates",
"GB": "United Kingdom"
}
我究竟做錯了什么?
你可以在這里玩:
https://codesandbox.io/s/js-playground-forked-xk005?file=/src/index.js
您將在控制台中看到結果。
將Object.entries
按值排序,然后使用Object.fromEntries
將此鍵值對數組轉換回 object:
Object.fromEntries(
Object.entries(obj)
.sort(([keyA, valueA], [keyB, valueB]) => valueA.localeCompare(valueB))
)
請注意,如果有數字鍵或 object 發生突變(因為這會再次更改排序順序),則排序對象是沒有意義的。
試試這個進行排序:
const sortObject = obj => {
const ret = {}
Object.values(obj)
.sort()
.forEach(val => {
const key = Object.keys(obj).find(key => obj[key] === val)
ret[key] = val
})
return ret
}
這對你有用嗎?
function sortObject(obj) { return Object.fromEntries(Object.entries(obj).sort((a,b)=>a[1].localeCompare(b[1]))); } const data = { "AD": "Andorra", "AE": "United Arab Emirates", "AF": "Afghanistan", "AG": "Antigua and Barbuda", "AI": "Anguilla", "AL": "Albania", "AM": "Armenia", "AN": "Netherlands Antilles", "GB": "United Kingdom" } // data is the list of countries const result = sortObject(data); console.log(result);
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