对于以下对象数组
[
{"Corp": "ABC", "T1": "HW A/V", "T2": "A/V System","T3": "Audio","Prod": "Audio System","Mfr": "One"},
{"Corp": "ABC", "T1": "HW A/V", "T2": "A/V System","T3": "Audio","Prod": "Audio System","Mfr": "Two"},
{"Corp": "ABC", "T1": "HW A/V", "T2": "A/V System","T3": "Video","Prod": "Video System","Mfr": "Other"}
]
我打算得到一个如下所示的不平坦的对象:
[{
"Corp": "ABC",
"List": [{
"T1": "HW A/V",
"List": [{
"T2": "A/V System",
"List": [{
"T3": "Audio",
"List": [{
"Prod": "Audio System",
"List": [
{"Mfr": "One"},
{"Mfr": "Two"}
]
}]
},
{
"T3": "Video",
"List": [{
"Prod": "Video System",
"List": [
{"Mfr": "Other"}
]
}]
}]
}]
}]
}] 我确实得到了我打算如上所述获得的结果。我用下划线来得到结果。以下代码片段为我完成了这项工作:
var items = _.map(_.groupBy(itemList, 'Corp'), function (a) {
return _.extend(_.pick(a[0], 'Corp'), {
List: _.map(_.groupBy(a, 'T1'), function (b) {
return _.extend(_.pick(b[0], 'T1'), {
List: _.map(_.groupBy(b, 'T2'), function (c) {
return _.extend(_.pick(c[0], 'T2'), {
List: _.map(_.groupBy(c, 'T3'), function (d) {
return _.extend(_.pick(d[0], 'T3'), {
List: _.map(_.groupBy(d, 'Prod'), function (e) {
return _.extend(_.pick(e[0], 'Prod'), {
List: _.map(e, function (elem) {
return _.pick(elem, 'Mfr')
})
});
})
});
})
});
})
});
})
});
});
现在,我正在寻找的是,如果有人可以增强我的解决方案。我想为这个过程优化空间和时间。
PS:早上,我问了一个类似的问题,要求提供解决方案,这个问题被标记为 TOO BROAD 并被置于 HOLD < / strong>,所以我已经用这个问题添加了我的解决方案,现在我正在寻找的是一个更好的解决方案。
由于
答案 0 :(得分:2)
为了避免使用符号化的语句,您可能需要定义一个“扩展键”列表。并迭代它们。
通过以下方式自动提取密钥是半诱人的:
expandKeys = _.keys(itemList[0]);
但是由于Javascript并不能保证对象中键的顺序,所以你真的应该明确地定义这个列表。
下面是一些示例代码。
var itemList = [
{"Corp": "ABC", "T1": "HW A/V", "T2": "A/V System", "T3": "Audio", "Prod": "Audio System", "Mfr": "One"},
{"Corp": "ABC", "T1": "HW A/V", "T2": "A/V System", "T3": "Audio", "Prod": "Audio System", "Mfr": "Two"},
{"Corp": "ABC", "T1": "HW A/V", "T2": "A/V System", "T3": "Video", "Prod": "Video System", "Mfr": "Other"}
];
var expandKeys = [ 'Corp', 'T1', 'T2', 'T3', 'Prod', 'Mfr' ];
function expandList(list, keys) {
var node, obj, root = {};
_.each(list, function(item) {
obj = root;
_.each(keys, function(key) {
obj = (obj.List = obj.List || []);
node = _.find(obj, function(i) { return i[key] == item[key]; });
if(node === undefined) {
obj.push(node = {});
node[key] = item[key];
}
obj = node;
});
});
return root.List;
}
var res = expandList(itemList, expandKeys);
console.log(res);
&#13;
<script src="http://underscorejs.org/underscore-min.js"></script>
&#13;