javascript - 按特定顺序对 JavaScript 对象数组进行排序(使用现有函数)

Question

给定一个对象数组:

{    key: "a",    value: 42},{    key: "d",    value: 28},{    key: "c",    value: 92},{    key: "b",    value: 87}

and an array of keys:

["c", "a", "b", "d"]

是否有 ECMAScript 函数或第 3 方 JavaScript 库可以让您对第一个对象数组进行排序 - 在一行/函数调用中，以匹配键的顺序 在第二个数组中指定，结果为:

{    key: "c",    value: 92},{    key: "a",    value: 42},{    key: "b",    value: 87},{    key: "d",    value: 28}

提供函数或算法的其他问题:

• Javascript - sort array based on another array - Stack Overflow
• javascript - How do I sort an array of objects based on the ordering of another array? - Stack Overflow

类似/相关问题:

• Sorting an Array of Objects in PHP In a Specific Order
• php - Sort array of objects

Answer 1

只需使用 indexOf 将 key 转换为正确的顺序:

var order = ["c", "a", "b", "d"];
_.sortBy(arr, function(obj){ 
    return _.indexOf(order, obj.key);
});

Fiddle

如果有很多键，那么从数组中创建一个 HashMap 是有利的，例如:

var order = ["c", "a", "b", "d"];
var orderMap = {};
_.each(order, function(i) { orderMap[i] = _.indexOf(order, i); });

这使得键排序查找时间变得恒定，而不是 O(n)。 (Fiddle)