在下划线.js中展平嵌套数组/对象
flattening nested arrays/objects in underscore.js
我有一个对象数组,如下所示(尽管下面的示例中只有一个元素)
[
{
"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}
]
}
]
我试图使用下划线.js来展平每个元素,所以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,
}
]
我已经对"load"元素进行了排序(尽管不是一般的),因为这只是一个已知的 3 字段对象。
不过,扁平化 cpu 阵列暗示了我。我的代码如下,以及我的代码生成的输出
我知道我可以写一个js循环并完成它,但是我看到了一些非常优雅的下划线解决方案,我确信这是可能的。有什么建议吗?
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)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
}
]
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
}
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