在underscore.js中扁平化嵌套的数组/对象

Question

在underscore.js中扁平化嵌套的数组/对象

javascriptnode.jsunderscore.js

5

我有一个对象数组，如下所示（尽管下面的例子只有一个元素）

[
    {
        "uptime":0,
        "load":{"x":0.11,"y":0.22,"z":0.33},
        "cpu":[
            {"u":111,"n":112,"s":113,"i":114,"q":115}, 
            {"u":211,"n":212,"s":213,"i":214,"q":215}
        ]
    }
]

我正在使用underscore.js来展平每个元素，使整个数组看起来像这样：

[
    {
        "uptime":0,

        "load_x": 0.11
        "load_y": 0.03
        "load_z": 0.01,

        "cpu1_u": 111,
        "cpu1_n": 112,
        "cpu1_s": 113,
        "cpu1_i": 114,
        "cpu1_q": 115,

        "cpu2_u": 211,
        "cpu2_n": 212,
        "cpu2_s": 213,
        "cpu2_i": 214,
        "cpu2_q": 215,
    }
]

我已经将“load”元素排列好了（虽然不是通用的），因为那只是一个已知的三字段对象。

但是，我的代码无法展开cpu数组。以下是我的代码及其生成的输出

我知道我可以只写一个js循环就行了，但我看到了一些非常优雅的underscore解决方案，而且我相信这是可能的。请给予任何建议？

我的代码

var profiles = [
    {
        "uptime":0,
        "load":{"x":0.11,"y":0.22,"z":0.33},
        "cpu":[
            {"u":111,"n":112,"s":113,"i":114,"q":115}, 
            {"u":211,"n":212,"s":213,"i":214,"q":215}
        ]
    }
];

var flat = _.map(profiles, function(profile) {
        var p = _.extend(_.omit(profile, 'load'), {
            load_1: Math.round(100*profile.load.x)/100, 
            load_5: Math.round(100*profile.load.y)/100, 
            load_15: Math.round(100*profile.load.z)/100
        });

        var cpuid = 0;
        var cpuobject =
            _.map(p.cpu, function(cpu) {
                cpuid++;
                return _.object(
                    _.map(cpu, function(val, key) {
                        var arr = ['cpu'+cpuid+'_'+key, val];
                        return arr;
                    })
                );
            });
        return _.extend(_.omit(p, 'cpu'), cpuobject);
    });

console.log(JSON.stringify(flat));

我的（错误的）输出

[
    {
        0: {
            cpu1_u: 233264700,
            cpu1_n: 0,
            cpu1_s: 64485200,
            cpu1_i: 1228073616,
            cpu1_q: 86100
        },
        1: {
            cpu2_u: 233264700,
            cpu2_n: 0,
            cpu2_s: 64485200,
            cpu2_i: 1228073616,
            cpu2_q: 86100
        },
        uptime: 0,
        load_1: 0.11,
        load_5: 0.03,
        load_15: 0.01
    }
]

- carpii

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- georg · Accepted Answer

例如：

flatten = function(x, result, prefix) {
    if(_.isObject(x)) {
        _.each(x, function(v, k) {
            flatten(v, result, prefix ? prefix + '_' + k : k)
        })
    } else {
        result[prefix] = x
    }
    return result
}


a =
{
    "uptime":0,
    "load":{"x":0.11,"y":0.22,"z":0.33},
    "cpu":[
        {"u":111,"n":112,"s":113,"i":114,"q":115},
        {"u":211,"n":212,"s":213,"i":214,"q":215}
    ]
}


result = flatten(a, {})

{
        "uptime": 0,
        "load_x": 0.11,
        "load_y": 0.22,
        "load_z": 0.33,
        "cpu_0_u": 111,
        "cpu_0_n": 112,
        "cpu_0_s": 113,
        "cpu_0_i": 114,
        "cpu_0_q": 115,
        "cpu_1_u": 211,
        "cpu_1_n": 212,
        "cpu_1_s": 213,
        "cpu_1_i": 214,
        "cpu_1_q": 215
}