将对象文字转换为排序的数组 [英] Converting an object literal to a sorted Array

问题描述

我有一个对象文字，其中其键的值是更多对象，内部对象的键之一称为等级"-并具有浮点值.我想将对象文字转换为内部对象的数组，并按"rank"的值排序.

I have an object literal, where the values of its key are more objects, and one of the keys of the inner objects is named "rank" - and has an floating point value. I want to convert the object literal to an array of the inner objects, sorted by the value of "rank".

输入对象:

{
452:{
     bla:123,
     dff:233,
     rank:2
  },
234:{
     bla:123,
     dff:233,
     rank:1
  }

}

输出数组:

[
 { bla:123, dff:233, rank:1},
 { bla:123, dff:233, rank:2 }
]

推荐答案

示例:

var data = {
    foo: {
        rank: 5
    },
    bar: {
        rank: 2
    },
    baz: {
        rank: 8
    }
};

JavaScript:

Javascript:

var mappedHash = Object.keys( data ).sort(function( a, b ) {
    return data[ a ].rank - data[ b ].rank;
}).map(function( sortedKey ) {
    return data[ sortedKey ];
});

首先将内部对象按sort的值赋予sort，然后将包含对象的map放入 Array .

That would first sort the inner objects by the value of obj.rank and after that map the containing objects into an Array.

结果:[{rank: 2}, {rank: 5}, {rank: 8}]

参考: > ，Array.prototype.map

Reference: Object.keys, Array.prototype.sort, Array.prototype.map

^{上面的代码包含ECMAscript 262第5版代码，该代码在所有现代浏览器中都可用.如果还想支持旧版浏览器，则需要包括各种ES5-Shim库之一.}

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